[The diagnosis of IgD-Myelomatosis (author's transl)].

Two patients with IgD-lambda myelomatosis are presented and the differential diagnosis is discussed. Typical features of this disease are the high incidence of Bence-Jones proteinuria, osteolytic lesions, amyloidosis and the predominance of male patients. Furthermore, an augmentation of serum IgD level to 165 mg% was observed in a 22-year-old female patient with presumed Coxsackie myocarditis. The theories in regard to IgD function are discussed.