Multiple Myeloma (MM) is a relatively rare disease and it presenting outside the bone marrow, known as extra-medullary myeloma (EMM), is rarer still. The lung parenchyma is an especially unusual site of involvement. We report a case in which the myeloma was diagnosed after we discovered the presence of monoclonal plasma cells in the bronchoalveolar lavage fluid (BAL). Analysis of BAL fluid for the presence of plasma cells provides a noninvasive means of establishing the diagnosis. Interstitial lung disease as pulmonary manifestation of multiple myeloma is even rarer only isolated cases with histological proofs have been reported in the literature.