Multiple myeloma-amyloidosis presenting as pseudomyopathy.

Amyloidosis is a generic term that refers to the deposition of amyloid fibrils in bodily tissues. Its onset is usually after 40 years of age, with localized or systemic involvement associated with multiple myeloma or chronic inflammatory diseases, and can mimic various rheumatic syndromes. We report the case of a patient with amyloidosis associated with multiple myeloma, showing clinical characteristics of pseudomyopathy.