Monarch Disease Ontology term MONDO_0004114 (urinary bladder small cell neuroendocrine carcinoma) is a highly aggressive carcinoma, histologically resembling small cell lung carcinoma. In most cases it is associated with carcinoma in situ. Also known as: SCCB, bladder small cell neuroendocrine cancer, bladder small cell neuroendocrine carcinoma, poorly differentiated neuroendocrine carcinoma of the bladder, small cell bladder cancer, small cell bladder carcinoma, small cell carcinoma of the urinary bladder, small cell carcinoma of urinary bladder.