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Apparent monoclonal origin of lymphocytes and plasma cells infiltrating ocular adnexal amyloid deposits: report of 2 cases.

Two cases of primary amyloidosis involving the orbit and lid respectively are described. Immunoperoxidase staining of the associated infiltrate of lymphocytes and plasma cells showed a clear preponderance of cells carrying light chains in one case and K in the other. The predominant heavy chains were IgA and IgG respectively. It is suggested that these cases are 'burnt out' local plasmacytomas.