[Unexpected computerized tomography findings in neoplasm staging of a patient with plasmacytoma].

A case of a 69-year-old male patient is described. Staging CT brought unexpected findings with therapeutic consequences. Pneumoperitoneum was the most important sign. A pneumoretroperitoneum and a dilatation of the colon sigmoldeum were also found. Intraoperatively a perforated sigmadiverticulitis was detected. Therefore, one should pay attention to extraskeletal changes during the staging of multiple myeloma.