A Curious Case of Hypercalcemia.

Humoral hypercalcemia of malignancy is rarely seen in urothelial cancer. In this report, we present a case of an 81-year-old female patient who presented with a markedly elevated calcium level leading to severe altered mental status and was found to have urothelial cancer. To our knowledge, only three cases of urothelial carcinoma with squamous cell differentiation have been reported.