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Brain Tumors

CNS tumors High-yield Verified · Sep 2026

A brain tumor is a primary tumor that first forms in the brain (such as glioma, glioblastoma or meningioma) or a secondary (metastatic) tumor that spreads to the brain from cancer elsewhere in the body.

A tumor in a fixed skull causes trouble by where it sits and by the swelling around it. Morning headache or headache that goes away after vomiting, a first seizure in an adult, weakness, speech or vision change and personality change are the warning signs. Worsening edema can be life-threatening. The nurse gives and tapers dexamethasone and watches glucose, performs stringent neurological checks after craniotomy, watches sodium and water balance, and teaches temozolomide rules: whole capsules, blood counts before each cycle and PCP prophylaxis.

What’s going wrong in the body

The normal physiology, where it fails, and why the body’s compensation backfires.

01 Primary vs metastatic — and which is most common

NINDS: "CNS tumors are known as primary tumors if they first form in the brain or spinal cord. They’re called secondary (or metastatic) tumors if they break off from a tumor somewhere else in the body and travel to the brain or spinal cord."

Metastases are the most common brain tumor overall. "Brain metastases outnumber primary neoplasms by at least 10 to 1, and they occur in 20% to 40% of cancer patients" (NCI). "Primary cancers such as lung, breast, and melanoma are most likely to metastasize to the brain." "Metastases to the brain are multiple in more than 70% of cases." They reach the brain through the blood: "Metastatic cancer passes through the bloodstream and enters the central nervous system through a breakdown of the blood-brain barrier. Clonal cells then proliferate, causing local invasion, displacement, inflammation, and edema."

Primary tumors. Gliomas "originating from glial cells in the brain and spinal cord" include glioblastoma (GBM), the most common primary malignant tumor: GBM accounts for "45.2% of primary malignant brain and central nervous system (CNS) tumors" (StatPearls). Meningiomas grow from the meninges; they are "usually benign, grow slowly, and generally don’t invade surrounding normal tissue." "Primary brain tumors rarely spread to other areas of the body, but they can spread to other parts of the brain and to the spinal axis."

Most adult brain tumors are metastases; among primary tumors, glioblastoma is the most common malignant one and meningioma is usually benign.

02 Why the symptoms happen — location plus pressure

Location. "The clinical presentation of various brain tumors is best appreciated by considering the relationship of signs and symptoms to anatomy." NINDS: "For example, a tumor in the motor area (which coordinates voluntary movement) may cause muscle weakness." The cerebellum "controls movement, balance, and posture," and NCI lists "Loss of balance and trouble walking" among symptoms. A convexity meningioma can cause weakness of the opposite limb; a posterior fossa meningioma can cause cerebellar signs, facial palsy and hearing loss.

Pressure and edema. "As the tumor grows, it causes pressure on surrounding brain cells, resulting in symptoms like headache, seizures, memory problems, personality changes, vision, language difficulty, weakness, and paralysis. Some of the symptoms may mimic a stroke." Peritumoral edema adds mass effect — "altered mental status due to a mass effect resulting from peritumoral edema" — and a posterior fossa tumor can cause "acute, obstructive hydrocephalus." Brain herniation is a listed complication.

Seizures. Pressure on surrounding brain includes seizures among its symptoms: "Seizures are a presenting symptom in approximately 20% of patients with supratentorial brain tumors," and during the illness "70% with primary parenchymal tumors and 40% with metastatic brain tumors develop seizures" (NCI). A first seizure in an adult with no other cause is a classic warning sign.

Brain-tumor symptoms come from pressure, edema and location — and edema is the part dexamethasone treats.

03 Treatment — surgery, radiation, temozolomide and steroids

"Neurosurgery (surgery on the CNS) is usually the first treatment doctors will consider to treat brain and spinal cord tumors." "Biopsy confirmation to corroborate the suspected diagnosis of a primary brain tumor is critical," and "A lesion in the brain should not be assumed to be a metastasis just because a patient has had a previous cancer."

Glioblastoma. "GBM gold standard treatment comprises surgical resection followed by adjuvant radiochemotherapy" — the Stupp protocol, radiation with temozolomide. "the oral agent temozolomide has replaced BCNU as the standard systemic chemotherapy for malignant gliomas." "The methylation of the MGMT promoter predicts improved survival and benefit from chemotherapy with alkylating agents." Tumor treating fields "use low-energy electrical fields to stop cancer cells from growing and dividing." Even so, "GBM remains an incurable disease with a median survival of only 15 months" (StatPearls).

Metastases. "The first step in the management of newly diagnosed brain metastases is the treatment of intracranial edema. Oral or intravenous steroids (such as dexamethasone) are commonly used." Options include radiation, radiosurgery, resection, corticosteroids and anticonvulsants; "Chemotherapy is usually not the primary therapy for most patients." Whole-brain radiotherapy is standard with poor performance status or many metastases, weighed against "neurocognitive side effects."

Meningioma. "Asymptomatic, small, and slow-growing meningiomas are usually treated with observation and routine imaging."

Tissue first, then treatment by type: resection and temozolomide chemoradiation for glioblastoma, edema control then radiation for metastases, observation for small meningiomas — with steroid tapering and temozolomide safety checks along the way.

Causes & risk factors

Modifiable factors are teaching targets — the patient can act on them.

Cancer elsewhere (for metastases) — lung, breast and melanoma most often; "Up to half of metastatic brain tumors are from lung cancer" (NCI) High-dose ionizing radiation — "The only well-established causative factor implicated in GBM"; mobile phones have not been shown to raise GBM risk, though long-term use "needs further confirmation" Familial syndromes — neurofibromatosis type 1 and 2, von Hippel-Lindau disease, Li-Fraumeni syndrome Vinyl chloride exposure — "may be a risk factor for glioma" modifiable Immunosuppression — transplant recipients and patients with AIDS have a substantially increased risk of primary CNS lymphoma [MEN] Hormonal and other factors — obesity, alcohol use disorder, radiation exposure, hormone replacement therapy, oral contraceptives, breast cancer; female-to-male ratio 2.3:1 Older age — CNS tumors are "most common in older adults" (NINDS)

Signs & symptoms

Each finding tied to the mechanism that produces it — and the triage it calls for.

Headache — morning headache, or headache that goes away after vomiting; gradually worsening Hold & notify
Why: Pressure from tumor and edema. NINDS: "Headaches are the most common brain tumor symptom." NCI patient list: "Morning headache or headache that goes away after vomiting."
First seizure in an adult with no other cause Hold & notify
Why: Tumor pressure on surrounding brain — NINDS flags seizures "particularly if seizures start with no underlying cause during adulthood." About 20% of supratentorial tumors present this way (NCI).
Personality, mood or behavior change; memory or concentration problems; lethargy Hold & notify
Why: Tumor effects on the brain; with brain metastases, NCI notes family members or friends may notice "Lethargy." "Emotional lability." "Personality change."
Focal deficits — weakness of an arm or leg, speech, vision or hearing problems, loss of balance and trouble walking Hold & notify
Why: Location-specific damage (a motor-area tumor may cause weakness; posterior fossa meningiomas can cause cerebellar symptoms). "Some of the symptoms may mimic a stroke."
Frequent nausea and vomiting; papilledema Hold & notify
Why: Raised pressure. StatPearls: examine for papilledema and ask about "headaches, blurry vision, and nausea."
Worsening headache with vomiting, falling level of consciousness, or new deficit — signs of worsening edema, hydrocephalus or herniation Report immediately
Why: "As cerebral edema may be a life-threatening condition, aggressive treatment is necessary." Brain herniation and "acute, obstructive hydrocephalus" are listed complications. Full ICP assessment is on the increased-icp page.
[MEN] Often no symptoms (incidental), or upper motor neuron signs and anosmia
Why: "Some patients are asymptomatic, whereas others may experience profound neurological deficits"; hyperreflexia, positive Babinski sign and paresis, plus anosmia, are reported.

Diagnostics

Test In this disorder Normal
MRI brain with contrast NINDS: MRI is "the gold standard for diagnosing CNS tumors"; for suspected metastases "fine-slice MR of the brain with contrast is the gold standard." GBM: "Central hypointensity in T1 due to necrosis and peripheral hyperintensities in T2/FLAIR sequences due to edema." Mass(es), edema; GBM: central necrosis with surrounding edema —
Head CT (emergency department) "A head CT is an excellent initial study to evaluate for acute intracranial findings." Hemorrhage, edema, asymmetry —
Biopsy (stereotactic or at resection) "Biopsy confirmation … is critical." A stereotactic biopsy is used for deep, hard-to-reach tumors. Do not assume a lesion is a metastasis because of a past cancer. Tumor type and grade —
[GBM] MGMT promoter methylation Molecular marker guiding temozolomide benefit. Methylated = better survival and benefit from alkylating chemotherapy —
Neurological and eye (papilledema) examination "A complete neurologic examination should be performed." "An ophthalmic examination should be performed to evaluate for papilledema." Focal deficits; papilledema from raised pressure —
[TMZ] ANC and platelets before each cycle; liver tests Label: "Monitor absolute neutrophil count (ANC) and platelet count prior to each cycle and during treatment." Liver tests at baseline, midway through cycle 1, before each cycle and 2–4 weeks after the last dose. During concurrent chemoradiation, StatPearls recommends weekly CBC with differential and liver tests. Withhold until ANC ≥ 1.5 × 10⁹/L and platelets ≥ 100 × 10⁹/L TEMODAR label —
[DEX] Glucose, HbA1c, electrolytes, blood pressure StatPearls monitoring list for dexamethasone; "large doses can increase blood pressure." Steroid hyperglycemia, electrolyte imbalance, BP rise —

Complications

Black-box warning — most severe: ■ Worsening cerebral edema, hydrocephalus and herniation Report immediately
"As cerebral edema may be a life-threatening condition, aggressive treatment is necessary." Complication lists include increased intracranial pressure, hydrocephalus, brain herniation and hemorrhage into the tumor.
Declining consciousness, worsening headache with vomiting or a new deficit needs immediate escalation; see the increased-icp page for the full assessment.
Warning: [CRAN] Post-craniotomy complications Hold & notify
Epidural or subdural hematoma and contusion, CSF leak and pseudomeningocele, tension pneumocephalus, seizures, and meningitis ("The incidence of postoperative meningitis is 2.2%").
Post-op care calls for "Stringent neurological assessment and monitoring," hemodynamic surveillance, seizure prophylaxis, analgesia, fluid and electrolyte monitoring, and DVT prophylaxis. A CSF leak raises surgical-site infection risk. Report any decline in neurological status.
Warning: [CRAN] Sodium and water disorders — SIADH, diabetes insipidus, cerebral salt wasting Hold & notify
Management "includes the syndrome of inappropriate antidiuretic hormone, diabetes insipidus, or cerebral salt wasting"; "Electrolyte abnormalities: the most common being hyponatremia and hypernatremia."
Monitor fluids and electrolytes (sodium) and report changes; treatment is on the siadh-diabetes-insipidus page.
Warning: Seizures Hold & notify
"The use of anticonvulsants is mandatory for patients with seizures." Gliomas are "prone to seizures, malignant edema, and complication-related immobility."
Seizure care and status epilepticus are on the seizure-disorders page.
Warning: [TMZ] Myelosuppression and Pneumocystis pneumonia Hold & notify
Low blood counts "are common with TEMODAR but it can also be severe and lead to death." "Closely monitor all patients, particularly those receiving steroids, for the development of lymphopenia and PCP."
PCP prophylaxis is given during the concomitant (radiation) phase and continued if lymphopenia persists. Teach patients to contact the provider immediately for bleeding, fever or other signs of infection, and for new or worsening breathing symptoms (label); fever with low counts — see the oncologic-emergencies page.
Warning: [TMZ] Hepatotoxicity; embryo-fetal toxicity; secondary cancers Hold & notify
"Fatal and severe hepatotoxicity have been reported." Temozolomide "Can cause fetal harm." "Myelodysplastic syndrome and secondary malignancies, including myeloid leukemia, have been observed."
Liver tests on schedule; effective contraception for females of reproductive potential, and condoms for male patients with partners who are or could become pregnant.
Caution: [DEX] Steroid adverse effects Hold & notify
"The most frequently reported adverse effect by patients is the presence of insomnia after use." Others include indigestion, fluid retention, electrolyte imbalances, weight gain, agitation and depression; latent fungal, parasitic and bacterial infections "may become active."
"Suppression of the hypothalamus-pituitary-adrenal axis (HPA axis) occurs with use, and therefore the rapid withdrawal of dexamethasone is not recommended." Use caution with peptic ulcer disease; steroids may cause osteoporosis; no live vaccines during use.
Caution: Radiation effects and pseudoprogression
Radiation effects include "radiation dermatitis, neurocognitive toxicity, endocrinopathies" and more; NINDS: "Side effects usually begin about two weeks after treatment starts," with late effects including a secondary cancer.
After chemoradiation for GBM, pseudoprogression "is usually asymptomatic" and must be distinguished from true progression "to avoid abrupt treatment discontinuation."

Medications for this condition

Why each class is prescribed here — every card links to its full pharmacology page.

Corticosteroids First-line
Endocrine · prednisone

Dexamethasone for peritumoral (vasogenic) edema. "Dexamethasone, mannitol, and furosemide are used to treat the peritumoral edema associated with brain tumors." For new metastases, treating edema is "The first step," and "After the initial clinical response, which can occur rapidly, the dose may be tapered to avoid many of the adverse effects of long-term high dose steroid administration." Never stop abruptly — HPA-axis suppression. Monitor glucose and HbA1c, electrolytes and blood pressure; use caution in peptic ulcer disease; watch for infection and insomnia. On temozolomide, patients receiving steroids need particularly close monitoring for lymphopenia and PCP (label). No doses here — see the class page.
Anticonvulsants
Nervous · phenytoin

"The use of anticonvulsants is mandatory for patients with seizures" (NCI); NINDS: "Anticonvulsants to treat or prevent seizures." After craniotomy, the post-op bundle includes "Seizure prophylaxis," and "Levetiracetam is superior to phenytoin for de novo seizures following craniotomy" (StatPearls).
Antineoplastic / Chemotherapy Overview High-alert
Oncology

[GBM] Temozolomide with radiation, then as maintenance (TEMODAR label). Take at the same time each day, consistently with or without food; swallow capsules whole — "TEMODAR capsules should not be opened, chewed, or dissolved." If powder touches skin, "wash the affected area with water immediately." Check ANC and platelets before each cycle; give PCP prophylaxis in the concomitant phase; liver tests on schedule; contraception. [MET] "Chemotherapy is usually not the primary therapy for most patients." No doses here — see the class page.
Antiemetics
Digestive / GI · ondansetron

[TMZ] "To reduce nausea and vomiting, take TEMODAR on an empty stomach or at bedtime" and consider antiemetic therapy before and after each dose (label). [CRAN] "Postoperative nausea and vomiting (PONV) prophylaxis" is part of the craniotomy bundle. No specific antiemetic is named in the sources.

Beyond medications

  • Neurosurgery — usually the first treatment; sometimes awake surgery so "surgeons can check their movement and speech during the procedure." ICU availability is discussed before surgery; StatPearls notes that routine ward admission "appears safe for most patients," with ICU admission for risks such as a lengthy operation, profound blood loss, new neurological deficits or a reduced level of consciousness.
  • Radiation — with temozolomide for GBM; radiosurgery or whole-brain radiation for metastases (weigh neurocognitive effects).
  • Tumor treating fields — low-energy electrical fields used for glioblastoma.
  • Observation — for small, slow-growing, asymptomatic meningiomas, with routine imaging.
  • Post-craniotomy bundle — stringent neurological assessment, hemodynamic surveillance, seizure prophylaxis, analgesia, fluid and electrolyte monitoring, chest physiotherapy, nutrition, DVT prophylaxis (LMWH and compression devices), early mobilization and PONV prophylaxis.
  • Rehabilitation — "Early initiation of rehabilitation is essential," with physical, occupational and speech therapists and neuropsychologists.
  • Palliation for frail patients with metastases — "Many of these patients simply benefit from palliation and pain control."

Nursing considerations

The RN-specific layer — each action paired with the reason it matters.

Assessment
Perform and trend a full neurological assessment — level of consciousness, strength, sensation, coordination, cranial nerves, speech, vision and memory — and compare with baseline.
Why: Symptoms follow tumor location and edema; after craniotomy the bundle calls for "Stringent neurological assessment and monitoring."
Ask about headache pattern (morning, relieved by vomiting, worsening), nausea, seizures and personality change reported by family.
Why: Classic brain-tumor cues; with brain metastases, family members or friends may notice lethargy, emotional lability or personality change (NCI).
On dexamethasone, check blood glucose, electrolytes and blood pressure, sleep and mood, and signs of infection.
Why: StatPearls monitoring list; insomnia is the most common complaint and immunosuppression can reactivate infections.
After craniotomy, monitor fluids and electrolytes (sodium), and watch for CSF leak and signs of infection.
Why: SIADH, diabetes insipidus and cerebral salt wasting occur; CSF leak and meningitis are listed complications.
On temozolomide, verify ANC and platelets before each cycle and scheduled liver tests.
Why: Label: withhold until ANC ≥ 1.5 × 10⁹/L and platelets ≥ 100 × 10⁹/L; fatal hepatotoxicity has been reported.
Interventions
Falling level of consciousness, worsening headache with vomiting, or a new deficit: escalate immediately and prepare for urgent treatment of edema.
Why: Cerebral edema "may be a life-threatening condition" needing aggressive treatment; herniation and hydrocephalus are complications.
Give dexamethasone as ordered and follow the taper; never stop it abruptly.
Why: HPA-axis suppression — "the rapid withdrawal of dexamethasone is not recommended."
Give anticonvulsants as ordered to patients with seizures and after craniotomy (prophylaxis).
Why: "The use of anticonvulsants is mandatory for patients with seizures."
Give temozolomide capsules whole with water, at the same time daily, consistent with food; handle damaged capsules with care and wash any powder off skin with water immediately.
Why: Label handling rules; opened capsules risk inhalation or skin and mucous-membrane contact.
Give PCP prophylaxis as ordered during chemoradiation and DVT prophylaxis after surgery and during immobility.
Why: TMZ plus steroids deplete lymphocytes; gliomas cause "complication-related immobility."
Patient and family teaching
Report new or worsening headache, vomiting, weakness, speech or vision change, confusion or seizures; seek emergency care for drowsiness that is getting worse.
Why: Signs of tumor growth or edema; worsening edema can be life-threatening.
Take dexamethasone exactly as prescribed, with the taper — do not stop suddenly; report high blood sugar, insomnia, mood change or signs of infection.
Why: Adrenal suppression and steroid adverse effects.
Temozolomide: swallow whole; take nausea medicine as directed; keep lab appointments; contact the provider immediately for bleeding, fever or other signs of infection, or new or worsening breathing symptoms such as shortness of breath or dry cough; use contraception.
Why: Myelosuppression, PCP and embryo-fetal toxicity are label warnings.
If more temozolomide is taken than prescribed, call the provider or get emergency help right away.
Why: TEMODAR patient information.
Discuss complementary therapies with the team before using them, and consider a second opinion at an experienced center.
Why: NINDS: some therapies "may be harmful" during standard treatment.

How a real nurse thinks

The clinical-judgment loop, worked for a typical presentation — reasoning, not reference.

  1. 1
    Recognize cues

    Morning headache relieved by vomiting, a drop in level of consciousness from last night and a new left-arm drift. The high glucose is a steroid effect and a secondary cue.

  2. 2
    Analyze cues

    Pressure and edema around the tumor cause headache, mass effect and "altered mental status due to a mass effect resulting from peritumoral edema." Cerebral edema "may be a life-threatening condition," and herniation is a listed complication.

  3. 3
    Prioritize

    Declining consciousness with a new deficit comes first — worsening edema needs aggressive treatment. Glucose and the bedtime temozolomide dose come after.

  4. 4
    Generate solutions

    Notify the provider immediately, stay with him and repeat neuro checks. Prepare for urgent evaluation and edema treatment, and report the glucose.

  5. 5
    Take action

    SBAR: 58-year-old with GBM on chemoradiation and dexamethasone; morning headache with vomiting, now drowsy (was alert last night) with new left-arm drift; BP 146/80; glucose 238. Concerned about worsening cerebral edema — requesting immediate evaluation.

  6. 6
    Evaluate

    Reassess level of consciousness and motor function frequently; confirm edema treatment is started, then recheck glucose. Resume routine temozolomide teaching once he is stable.

Scenario — you’re the nurse

Work each question before revealing the answer. Rationales explain the wrong options too.

Neuro-oncology unit · week 3 of chemoradiation, 0700

A 58-year-old man with glioblastoma of the right frontal lobe had resection 5 weeks ago and is now receiving radiation with daily temozolomide. He is on dexamethasone, a PCP prophylaxis drug and levetiracetam. His wife says he ‘hasn’t been himself’ since yesterday.

0600 — woke with a severe headache that eased after he vomited once
0700 neuro check — drowsy, opens eyes to voice (alert at 2200 last night); new left-arm drift
Vital signs — BP 146/80 · HR 78 · RR 16 · T 37.0 °C
Labs — glucose 238 mg/dL; ANC and platelets above the label thresholds
Temozolomide dose — due at bedtime; capsule bottle at bedside
Q1 Multiple choice
Which finding in this patient requires the nurse to act first?
  1. A. Blood glucose of 238 mg/dL
  2. B. New drowsiness and left-arm drift after a morning headache with vomiting
  3. C. Temozolomide dose due at bedtime
  4. D. BP 146/80
Reveal answer & rationale
Answer: B
A falling level of consciousness with a new deficit suggests worsening peritumoral edema, which "may be a life-threatening condition" needing aggressive treatment (B). Steroid hyperglycemia (A) is reported but is not the priority. The dose (C) can wait. The mild BP rise (D) is not the main threat and may reflect steroids.
Q2 Select all that apply
Which instructions about temozolomide are correct? Select all that apply.
  1. A. Swallow the capsules whole with a glass of water
  2. B. Take it at the same time each day, consistently with or without food
  3. C. Open the capsule and sprinkle it on applesauce if swallowing is hard
  4. D. Report shortness of breath, fever, chills or dry cough
  5. E. Keep blood-count appointments before each cycle
  6. F. If powder gets on the skin, wash it off with water immediately
Reveal answer & rationale
Answer: A, B, D, E, F
The label says capsules "should not be opened, chewed, or dissolved but should be swallowed whole" (A — and C is wrong); take at the same time daily and consistently with respect to food (B); report PCP symptoms (D); ANC and platelets are checked before each cycle (E); powder contact is washed with water immediately (F).
Q3 Multiple choice
A patient with brain metastases has improved on dexamethasone and asks to stop it tomorrow. What should the nurse explain?
  1. A. It can be stopped at once because the swelling is better
  2. B. The dose is tapered because dexamethasone suppresses the HPA axis, so rapid withdrawal is not recommended
  3. C. It must be taken for life
  4. D. Stopping it only matters if blood sugar is high
Reveal answer & rationale
Answer: B
"Suppression of the hypothalamus-pituitary-adrenal axis (HPA axis) occurs with use, and therefore the rapid withdrawal of dexamethasone is not recommended"; after response "the dose may be tapered" (B). Stopping at once (A) is unsafe. Long-term prescriptions are avoided where possible (C). Glucose (D) is monitored, but the taper is about adrenal suppression.
Q4 Multiple choice
Before a new temozolomide cycle, which result means the nurse should hold the dose and notify the provider, per the TEMODAR label?
  1. A. ANC 1.2 × 10⁹/L
  2. B. ANC 2.0 × 10⁹/L and platelets 150 × 10⁹/L
  3. C. Hemoglobin 12 g/dL
  4. D. Serum sodium 139 mmol/L
Reveal answer & rationale
Answer: A
The label says to withhold temozolomide until "an absolute neutrophil count (ANC) of 1.5" × 10⁹/L or greater and platelets of 100 × 10⁹/L or greater — an ANC of 1.2 is below the threshold (A). B meets both thresholds. C and D are not the label's dosing criteria.
Q5 Multiple choice
Which statement about adult brain tumors is accurate?
  1. A. Glioblastoma is the most common brain tumor of any kind
  2. B. Metastases from cancers elsewhere outnumber primary brain tumors
  3. C. Meningiomas are usually malignant
  4. D. A new lesion in someone with past cancer can be assumed to be a metastasis
Reveal answer & rationale
Answer: B
"Brain metastases outnumber primary neoplasms by at least 10 to 1" (B). Glioblastoma is the most common primary malignant tumor, not the most common overall (A). Meningiomas are "usually benign" (C). NCI warns a lesion "should not be assumed to be a metastasis just because a patient has had a previous cancer" (D).

Common questions

What causes brain tumors?
Common causes and risk factors include cancer elsewhere (for metastases) — lung, breast and melanoma most often; "up to half of metastatic brain tumors are from lung cancer" (nci), high-dose ionizing radiation — "the only well-established causative factor implicated in gbm"; mobile phones have not been shown to raise gbm risk, though long-term use "needs further confirmation", familial syndromes — neurofibromatosis type 1 and 2, von hippel-lindau disease, li-fraumeni syndrome, vinyl chloride exposure — "may be a risk factor for glioma", immunosuppression — transplant recipients and patients with aids have a substantially increased risk of primary cns lymphoma, and others.
What headache pattern suggests a brain tumor?
"Headaches are the most common brain tumor symptom" (NINDS). NCI lists "Morning headache or headache that goes away after vomiting" among brain-tumor symptoms, and NINDS notes headaches "may gradually get worse over time."
What is the most common brain tumor?
In adults, metastases from other cancers — they outnumber primary tumors at least 10 to 1 (NCI). Among primary tumors, glioblastoma is the most common malignant one (StatPearls: 45.2% of primary malignant brain and CNS tumors); meningiomas are common and usually benign.
Why is dexamethasone given, and why is it tapered?
It shrinks the edema around a tumor — the first step for new brain metastases. Because it suppresses the HPA axis, "the rapid withdrawal of dexamethasone is not recommended"; the dose is tapered once the patient responds.
Why does a patient on temozolomide get PCP prophylaxis?
Temozolomide, especially with steroids, can cause lymphopenia. The label says to give Pneumocystis pneumonia prophylaxis during the concomitant phase and to monitor closely "particularly those receiving steroids."
Do mobile phones cause brain tumors?
StatPearls: "using mobile phones does not increase the risk of developing GBM; however, the association with long-term use needs further confirmation." The only well-established cause of GBM is high-dose ionizing radiation.

Sources

Reviewed by Hae Suk Lee, RN

Educational summary for nursing students. Scenarios are fictional teaching cases. Always verify against current guidelines and your institution's protocols before acting in practice. Not medical advice.

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