The most common form of childhood brain tumor is?

SCTIMST Staff Nurse - 2015 (Set-B)

Child Health Nursing (Pediatrics)

Easy

Appeared in: SCTIMST Staff Nurse - 2015 (Set-B)

Explanation

Astrocytomas are the most common type of brain tumor in children, making up about 40% of all pediatric central nervous system (CNS) tumors.
The most frequent subtype is the Pilocytic Astrocytoma (WHO Grade I), which is often a low-grade, slow-growing tumor with a more favorable prognosis.
While gliomas are the most common category, astrocytoma is the single most common specific tumor type within that category.
In children, astrocytomas are most commonly found in the cerebellum, which is part of the infratentorial region of the brain.

Option A: Medulloblastoma is the most common malignant (cancerous) brain tumor in children, but it is less common overall than the typically low-grade astrocytomas.
Option C: Ependymomas, which arise from the cells lining the ventricles, are significantly less common than astrocytomas, accounting for only about 5% of childhood CNS tumors.
Option D: Glioma is a broad category of tumors that includes astrocytomas, ependymomas, and others. While astrocytoma is a type of glioma, it is the most specific and correct answer as it represents the single most common type.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Epidemiology of childhood brain tumors as background academic context rather than a clinical decision trigger.
Nurses must be vigilant in assessing children for signs of increased intracranial pressure (ICP), such as headache (especially in the morning), vomiting, lethargy, and irritability, as these can be early signs of a brain tumor.
A key nursing role involves performing frequent neurological checks, monitoring for changes in gait, coordination, vision, or consciousness, which could indicate tumor growth or complications like hydrocephalus.
What if? If the question asked for the most common brain tumor in infants (under 1 year), the answer would be choroid plexus tumors, highlighting how tumor prevalence changes significantly with age.

How to Approach the Question

Identify the keywords in the question: 'most common' and 'childhood brain tumor'.
Recall the major types of pediatric brain tumors, including astrocytoma, medulloblastoma, and ependymoma.
Differentiate between the 'most common overall' versus the 'most common malignant'. Astrocytomas are most common overall, while medulloblastomas are the most common malignant type.
Analyze the options. Recognize that 'Glioma' is a general category that includes 'Astrocytoma'. In multiple-choice questions, the most specific correct answer is usually the best choice.
Conclude that Astrocytoma is the single most frequent type of brain tumor in children, making it the best answer.

Concept Tested & Keywords

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E6 Nelson Textbook of Pediatrics(2024) — Volume 2 pp. 921-923, 917-919