Six months of gastrointestinal embarrassment in a 31-year old male patient were coped with by transversostomy and subsequent anti-tumour drug and irradiation treatment. However, histology tests of a pseudotumour removed from the abdominal cavity proved the presence of actinomycosis (actinomycoma). Once adequate treatment had been started, the intraabdominal process began to recede thus permitting the transversostomy to be discontinued.