Supratentorial primitive neuroectodermal tumor metastasis to the abdomen via a ventriculoperitoneal shunt.

Primitive neuroectodermal tumors (PNETs) include a heterogeneous group that originate from primitive neuroepithelial cells. PNETs are prone to cerebrospinal fluid seeding and central nervous system spread. Infratentorial PNET, or medulloblastoma, is a common brain tumor in children and metastatic spread to the abdomen via a ventriculoperitoneal (VP) shunt has been described. Supratentorial PNETs are much less common. We present a rare case of a predominantly supratentorial PNET metastasizing to the abdomen via a VP shunt and discuss the radiological findings. This case demonstrates the small but real risk of metastatic spread, which should be weighed when considering VP shunt placement.