Intradiverticular sarcomatoid carcinoma of the bladder: an overview starting from a peculiar case

Sarcomatoid carcinoma (SC) of the bladder is a rare and highly aggressive tumour, defined accord-ing to the World Health Organization (WHO) as a biphasic neoplasm exhibiting morphologic and/or im-munohistochemical evidence of epithelial and mesenchymal differentiation. SC of the urinary bladder is an uncommon neoplasm, accounting for 0.1 to 0.3% of all bladder malignancies and is more frequent during the seventh decade.As standard protocol of the university hospital in which the case was reported, the patient was informed at the admission and signed an informed consent allowing data collection for research purposes.