An autopsy case of intravascular lymphomatosis with dermatomyositis.

A 62-year-old man was admitted to hospital with general malaise, arthralgia, edema, and high-grade fever. He was diagnosed as dermatomyositis because of typical skin rashes and muscle weakness. His symptoms were improved by high-doses of prednisolone and cyclosporin A, with the exception of the skin rash over the back. High-grade fever developed again when tapering prednisolone. His condition deteriorated gradually. Paresthesia, hypothyroidism, metabolic acidosis, and disseminated intravascular coagulopathy occurred, and he died eight months after the first admission. Postmortem examination revealed intravascular proliferation of atypical mononuclear cells in the lumens of small vessels in all organs. Intravascular lymphomatosis (B cell type) was diagnosed.