[Sonography of 2 unusual extramedullary plasmacytomas]

The author describes two unusual extramedullary plasmacytomas. In the first patient, a 48-year old man, a mass was found sonographically in a retroperitoneal space. A discontinuity of the left iliac bone bordering on the tumour was prominent. Two years earlier, an epidural plasmacytoma had been removed. Subsequently, multiple osteolysis also developed in the left iliac bone. It was concluded that after destruction of the compact bone the plasmacytoma had infiltrated directly into the retroperitoneal space. An excretion of light chains of the kappa type was found in the urine. Six months after the tumour in the left iliac fossa had been confirmed, a second mass was seen in the abdomen. The patient died a few days later. Autopsy revealed plasmocytic infiltration of the retroperitoneal lymph nodes. In the second case, a man of 29 years of age, multiple tumours developed in the skin after removal of a meningeal plasmacytoma. Two months later, a recurrent intracranial tumour and a tumour in the left sinus maxillaris were found. Sonography of the "skin tumours" revealed intramuscular location and a cyst-like aspect; their consistency, however, was considerably increased. Histologically, plasmacytoma was present. Paraproteinaemia IgA of the kappa type was found. No lesions of the bone were seen. 11 months after the diagnosis of an intracranial tumour the patient died from local recurrence of the disease.