[Cytomorphologic characteristics of esophageal carcinosarcoma (pseudosarcoma)]. / Aspectos citomorfológicos del carcinosarcoma (seudosarcoma) esofágico.

We report a case of carcinosarcoma or pseudosarcoma of the esophagus, diagnosed through biopsy and endoscopic brush. We also describe several histogenetics hypothesis about this infrequent neoplasm and the difficulty of its diagnosis by means of endoscopy. We emphasize the endoscopic brush positivity and the description of its cytologic characteristics.