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Difficulty: HardPediatric Hematology and Oncology

Match each pediatric patient's clinical presentation and associated diagnostic findings with the most likely central nervous system tumor.

  • Cystic cerebellar mass with a mural nodule; histology shows bipolar cells with dense, eosinophilic corkscrew-like inclusions.Pilocytic astrocytoma
  • Solid midline cerebellar vermis mass; histology demonstrates sheets of small, round, blue cells forming Homer-Wright rosettes.Medulloblastoma
  • Mass located within the fourth ventricle causing hydrocephalus; histology reveals cells arranged around central blood vessels.Ependymoma
  • Suprasellar calcified cystic mass; patient presents with bitemporal hemianopsia and growth hormone deficiency.Craniopharyngioma

Answer

Pilocytic astrocytoma pairs with the cystic cerebellar mass containing Rosenthal fibers. Medulloblastoma pairs with the solid vermis mass containing Homer-Wright rosettes. Ependymoma pairs with the fourth ventricle mass containing perivascular pseudorosettes. Craniopharyngioma pairs with the suprasellar calcified mass.
Each pediatric brain tumor has a highly specific combination of anatomical location, imaging characteristics, and histology. Pilocytic astrocytoma is typically cystic with a mural nodule in the cerebellum and features Rosenthal fibers. Medulloblastoma is a solid vermis tumor characterized by Homer-Wright rosettes. Ependymoma occurs directly in the fourth ventricle with perivascular pseudorosettes. Craniopharyngioma is a suprasellar mass frequently causing bitemporal hemianopsia and pituitary dysfunction.

Step-by-Step Solution

1
Analyze the neuroimaging features and location for each presentation.
Identified a cystic cerebellar mass, a solid cerebellar mass, a distinct fourth ventricle mass, and a suprasellar mass.
Tumor location (e.g., suprasellar vs. infratentorial) and appearance (cystic vs. solid) narrow down the differential diagnosis for pediatric brain tumors.
2
Correlate imaging findings with specific histopathologic hallmarks.
Matched eosinophilic inclusions (Rosenthal fibers) to pilocytic astrocytoma, Homer-Wright rosettes to medulloblastoma, perivascular pseudorosettes to ependymoma, and calcified Rathke pouch remnants to craniopharyngioma.
Histology provides the definitive diagnosis and uniquely distinguishes between tumors that occur in similar anatomical locations.

Key Concept

Integration of neuroimaging characteristics, anatomical location, and specific histopathological findings in diagnosing pediatric CNS tumors.
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Topics

Pediatric Hematology and Oncology

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