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NBME 20 Answers

nbme20/Block 1/Question#38

A 9-year-old girl is brought to the physician ...

Diverticulum of the roof of the embryonic oral cavity

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submitted by hayayah(418),

Patient has a craniopharyngioma. Most common childhood supratentorial tumor. Derived from remnants of Rathke pouch (oral ectoderm). Calcification is common. Cholesterol crystals found in “motor oil”-like fluid within tumor.

A cystic suprasellar mass with calcifications and enhancement of the wall or solid portions in a child or adolescent is almost always a craniopharyngioma.

May be confused with pituitary adenoma (both cause bitemporal hemianopia).

dickass  Cholesterol crystals in motor oil +