MONDO_0017817 (primary localized amyloidosis) is a form of AL amyloidosis caused by the aggregation of insoluble amyloid fibrils derived from misfolded monoclonal immunoglobulin light chains usually produced by a plasma cell tumor and characterized by localized amyloid deposition with clinical manifestations restricted to the organ involved, most frequently urinary tract (bladder), eye, respiratory tract (larynx, lungs), and skin. Also known as: localised AL amyloidosis, localized AL amyloidosis.