Adult Medulloblastoma: Occurrence of a Rare Event.

Medulloblastoma is the most common type of aggressive pediatric primary brain malignancy. This case describes a 45-year-old Hispanic male with no significant past medical history who presented to the emergency department (ED) complaining of 15 days of 10/10 intractable headaches with one day of lightheadedness, confusion, and loss of balance. An urgent magnetic resonance imaging (MRI) of the brain revealed a 4.1 x 3.3 x 3.2 cm mass at the cerebellum, exerting a mass effect on the brainstem and mild tonsillar herniation. A pre-surgical physical exam revealed only a positive Babinski sign bilaterally with normal proprioception and cerebellar function. The intraoperative report concluded an undifferentiated neoplasm with a histological differential diagnosis of medulloblastoma, ependymoma, or other neuroepithelial neoplasms, suggesting a referral to a tertiary care center for further evaluation of the mass. Postsurgical complications included a severe vasogenic edema, causing obstructive hydrocephalus treated with frontal ventricular drainage, signs of meningitis treated with antibiotics, and hyponatremia. This case describes a rare occurrence of medulloblastoma in an adult patient, which required prompt diagnosis and urgent life-saving treatment.