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616 Pathology

A 3 year old boy is brought to the emergency depament after the acute onset of headache, vomiting, nuchal rigidity, and impaired mental status. MRI reveals a posterior fossa tumor that fills the 4th ventricle. Surgery is immediately staed, and intraoperative consultation leads to a “frozen section” diagnosis of medulloblastoma. Which of the following pathologic mechanisms most likely accounts for this child’s clinical presentation?

AAcute hemorrhage into the 4th ventricle
BAlteration of medullary function
CIncreased intracranial pressure
DInfiltration of the cerebellar vermis by the neoplasm
Pathology
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620 Pathology

A 24-year-old man is brought to the emergency room with symptoms of acute intestinal obstruction. His temperature is 38degC (101degF), respirations are 25 per minute, and blood pressure is 120/80 mm Hg. Physical examination reveals a mass in the right lower abdominal quadrant. At laparoscopy, there are numerous small bowel strictures and a fistula extending into a loop of small bowel. Which of the following is the most likely diagnosis?

AAdenocarcinoma
BCarcinoid tumor
CCrohn disease
DPseudomembranous colitis
Pathology
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