Bone Marrow Smear Examination In The Diagnosis Of Niemann-Pick B Disease

![Figure][1] A 73-year-old woman with a medical history of interstitial lung disease, aortic valve surgery, and coronary artery bypass surgery was referred for possible myeloma or lymphoma. Evaluation showed moderate thrombocytopenia (150 × 109/L), monoclonal gammopathy (immunoglobulin G