Dermatomyositis as a Paraneoplastic Syndrome of Metastatic Urothelial Carcinoma.

A 65-year-old man with history of urothelial carcinoma of the bladder developed dermatomyositis at the time of metastatic disease progression. This temporal association supports a likely paraneoplastic mechanism and highlights the importance of reassessing for disease progression in patients with urothelial carcinoma who develop new-onset dermatomyositis. Early recognition may facilitate timely oncologic evaluation and multidisciplinary management.