PathWays Case Study: May 9

A 10-month-old boy, previously healthy, began vomiting during a meal and became unresponsive. The CT scan demonstrated acute hydrocephalus and a large fourth ventricular tumor. This 6 cm. posterior fossa mass showed striking fluid levels and hemorrhagic products as well as relatively little enhancement as the dominant features. Suboccipital craniotomy was performed to resect the tumor. Specimens were sent to pathology for frozen diagnosis and permanent evaluation.

Posterior Fossa Mass HE High Power




Posterior Fossa Mass Smear and Permanent Section


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Rong Shen, B.Med.
Resident, Surgical Pathology
Mayo Clinic

Caterina Giannini, M.D., Ph.D.Caterina Giannini, M.D., Ph.D.
Consultant, Division of Anatomic Pathology
Mayo Clinic
Professor of Laboratory Medicine and Pathology
Mayo Clinic College of Medicine and Sciences


Rene Revier (@renecre)

Rene Revier

Rene Revier is an Editorial Assistant at Mayo Medical Laboratories. She supports Mayo Clinic PathWays and other corporate communications activities.