Intraparenchymal Choroid Plexus Papilloma: A Case Report and Literature Review

Choroid plexus papilloma (CPP) is a rare tumor of the central nervous system, which is usually located in the ventricular system and can metastasize to cisterns along the cerebrospinal fluid circulation. CPP is only rarely located in the intraparenchymal. Here, we describe an unusual case of such a tumor in a 25-yearold man. He initially experienced a sudden, generalized tonic-clonic seizure; further investigation showed no electrolyte imbalance and ruled out the possibility that the seizure was induced by medication. A sharply circumscribed regular mass lesion was identified on a magnetic resonance image in the medial aspect of the left temporal lobe together with invasion of the cortex. The patient underwent stereotaxic biopsy for a pathological diagnosis, followed by craniotomy with total resection of the mass 1 week later. The histopathology showed that the lesion was a CPP. The pathophysiology, radiology, classification, and treatment strategy of this rare tumor are discussed in the report.