Table 1 Comparison of MIDD and immunoglobulinic amyloidosis MIDD Amyloidosis Presentation Multivisceral or predominant involvement of an organ (kidney) Underlying disease Monoclonal immunoproliferative disorders, mostly myeloma. Monoclonal bone marrow plasma cell populations without overt malignancy. Possibility of 'non-secretory' forms. Deposits by EM (Granular) non-organized Fibrillar (13 pleated sheets) Spectrum LCDD: L chains, most K, either AL-amyloidosis: fragments (?)* of or apparently enlarged, normal-sized normal-sized or apparently enlarged or short. Frequent glycosylation L chains...