Dialysis-related amyloidosis manifested as masses in the buttocks.

A 40-year-old man had enlarging painful gluteal masses that developed after 17 years of hemodialysis. Pathologic examination revealed extensive deposition of beta 2-microglobulin amyloid. A bladder biopsy done during evaluation for possible transplantation also showed amyloid deposits. This constellation of findings has not been reported in a patient with beta 2-microglobulin amyloidosis. Patients with dialysis-related amyloidosis should be carefully assessed for systemic involvement. Renal transplantation may prevent further amyloid deposition and provide relief of pain.