[Actinomycosis of the stomach after gastric resection (author's transl)].

A case report is given of a patient, who developed actinomycosis at the anastomosis after Billroth II type of resection of the stomach. Physical examination revealed an upper abdominal mass in this patient; a clear diagnosis could not be established before surgery was done, the most likely diagnosis was considered to be a pancreatic pseudocyst. During surgery a carcinoma of the stomach was suspected. Microscopic examination finally yielded the diagnosis of tumor-like actinomycosis in the area of the anastomosis. Diagnosis, differential diagnosis and therapy are discussed.