Multiple Endocrine Neoplasms in a Patient with AL Amyloidosis-Associated Plasma Cell Dyscrasia.

Reports on patients with systemic amyloidosis-associated plasma cell dyscrasia (PCD) who have multiple endocrine tumors are very rare. Here we describe such a case. The patient was a 74-yr-old man with amyloid light-chain (AL) amyloidosis-associated PCD who had a null-cell adenoma of the pituitary and a latent papillary carcinoma of the thyroid gland. as well as a tubular adenoma of the sigmoid colon. The amyloid protein deposits reacted with the antibody to the n-immunoglobulin light chain. Since PCD by itself may be a risk factor for the development of subsequent neoplasms, the careful clinical evaluation of PCD patients is recommended.