Surgical removal of an undifferentiated abdominal sarcoma from a koi carp (Cyprinus carpio).

An undifferentiated abdominal sarcoma was removed surgically from a koi carp. The diagnostic procedures, including radiography and computed tomography, and the procedures for general anaesthesia and the surgical approach for a celiotomy in a fish are described. The gross and microscopic appearance of the tumour is described and lustrated.