Metastatic Urothelial Cell Carcinoma Presenting as an Isolated Malignancy to the Posterior Fossa: A Case Report and Review on the Literature.

Urothelial cell carcinoma (UCC) of the bladder infrequently metastasizes to the central nervous system (CNS). The incidence worldwide is approximately 1%. The cerebral hemispheres of the anterior and middle cranial fossa are the most common sites of CNS spread, and usually, multiple metastatic lesions are present. Infrequently, metastasis presents as a single solitary metastatic malignancy to the posterior fossa. Here, we present the case of a patient with bladder UCC who presented with a single solitary metastatic malignancy to the cerebellum. The authors discuss the signs, symptoms, mechanism of metastatic spread to the CNS, diagnosis, management, and prognosis of isolated posterior fossa metastasis originating from bladder UCC. We also performed an extensive literature search to identify all cases of metastatic bladder UCC presenting as an isolated malignancy to the posterior fossa in the past 20 years.