A 6-year-old boy presents with progressive morning headaches, vomiting, and ataxic gait for 3 weeks. Vital signs show BP 128/82 mmHg, HR 92 bpm, RR 20/min, temperature 37.2°C, SpO2 98% on room air. MRI reveals a 3 cm posterior fossa mass arising from the fourth ventricular wall causing obstructive hydrocephalus with elevated intracranial pressure. CSF analysis shows normal glucose and protein levels. Histopathology demonstrates perivascular pseudorosettes and true ependymal rosettes. Which tumor is most likely?
- A)Oligodendroglioma
- B)EpendymomaGABARITO
- C)Pilocytic astrocytoma
- D)Medulloblastoma
- E)Meningioma
Explicação
Ependymoma is correct. Pediatric ependymomas commonly arise from ependymal lining near the fourth ventricle and cause hydrocephalus by obstructing cerebrospinal fluid flow. Perivascular pseudorosettes are the characteristic histologic finding. Ver explicação completa e trilha adaptativa →