NCLEX Review Guide: Pediatric Brain Tumors

Common Pediatric Brain Tumors

• Medulloepithelioma is the most common pediatric brain tumor, accounting for 20% of all childhood CNS tumors and typically located in the posterior fossa.
• Craniopharyngioma arises near the pituitary gland and commonly causes endocrine dysfunction including growth hormone deficiency and diabetes insipidus.
• Brainstem gliomas have a poor prognosis due to their location and difficulty with surgical resection, often presenting with cranial nerve deficits.
• Cerebellar astrocytomas have the best prognosis among pediatric brain tumors when completely resected, with 90% five-year survival rates.

Early Warning Signs

• Increased intracranial pressure (ICP) manifests as morning headaches that worsen with coughing or straining, projectile vomiting without nausea, and altered level of consciousness.
• Infants present with bulging fontanelles, increased head circumference, high-pitched crying, and developmental regression or failure to meet milestones.
• School-age children exhibit behavioral changes, declining academic performance, visual disturbances, and coordination problems affecting handwriting or sports activities.
• Papilledema on fundoscopic examination indicates elevated ICP and requires immediate medical attention to prevent permanent vision loss.

Imaging & Laboratory Studies

• MRI with gadolinium is the gold standard for brain tumor diagnosis, providing detailed soft tissue contrast and tumor enhancement patterns.
• CT scan is used for emergency evaluation of hydrocephalus or when MRI is contraindicated, but provides less detailed tumor characterization.
• Lumbar puncture is contraindicated when increased ICP is suspected due to risk of brain herniation and must never be performed without imaging first.
• Tumor markers including alpha-fetoprotein (AFP) and beta-human chorionic gonadotropin (β-hCG) help classify germ cell tumors and guide treatment decisions.

Multimodal Approach

1. Surgical resection aims for maximal safe tumor removal while preserving neurological function, with extent of resection being the most important prognostic factor.
2. Radiation therapy is typically avoided in children under 3 years due to developing brain sensitivity, with proton beam therapy preferred when radiation is necessary.
3. Chemotherapy protocols vary by tumor type and may include vincristine, carboplatin, and temozolomide, with careful monitoring for myelosuppression and ototoxicity.
4. Corticosteroids (dexamethasone) reduce cerebral edema but require gradual tapering to prevent adrenal insufficiency and careful monitoring for infection risk.

Priority Interventions

• Neurological monitoring includes hourly assessment of level of consciousness, pupil response, motor function, and vital signs using age-appropriate Glasgow Coma Scale.
• Positioning with head of bed elevated 30 degrees promotes venous drainage and reduces ICP, while avoiding neck flexion that impedes cerebral blood flow.
• Seizure precautions include padded side rails, suction equipment at bedside, and anticonvulsant administration as ordered, with careful documentation of seizure activity.
• Infection prevention is critical during chemotherapy-induced neutropenia, requiring strict hand hygiene, isolation precautions, and monitoring for signs of infection.

Life-Threatening Complications

• Herniation syndromes require immediate intervention with hyperventilation, mannitol administration, and emergent neurosurgical consultation to prevent irreversible brain damage.
• Hydrocephalus may develop acutely or gradually, requiring ventriculoperitoneal shunt placement and ongoing monitoring for shunt malfunction or infection.
• Diabetes insipidus commonly occurs after surgery near the hypothalamus, presenting with excessive urination (>4ml/kg/hr) and hypernatremia requiring DDAVP replacement.
• Syndrome of inappropriate ADH (SIADH) causes hyponatremia and requires fluid restriction and careful electrolyte monitoring to prevent seizures.

Comprehensive Care Approach

• Developmental considerations include age-appropriate explanations, medical play therapy, and maintaining normal routines when possible to reduce anxiety and promote coping.
• Educational support involves coordinating with school systems for individualized education plans (IEP) and accommodations for cognitive or physical changes post-treatment.
• Long-term follow-up includes monitoring for treatment-related late effects such as endocrine dysfunction, cognitive impairment, and secondary malignancies requiring lifelong surveillance.
• Palliative care integration focuses on symptom management and quality of life regardless of prognosis, with early involvement improving outcomes and family satisfaction.

Frequently Missed Concepts

• Never perform lumbar puncture when increased ICP is suspected - this is a contraindication that can cause fatal herniation.
• Morning symptoms are classic for brain tumors due to overnight CO2 retention and increased ICP upon awakening.
• Corticosteroids mask infection signs during treatment, requiring vigilant monitoring for subtle changes in condition.
• Radiation therapy is generally avoided in children under 3 years due to significant developmental brain damage risk.