The presence of foam cells in the bone marrow, generally demonstrated by bone-marrow aspiration or biopsy. Foam cells have a vacuolated appearance due to the presence of complex lipid deposits, giving them a foamy or soap-suds appearance.
Synonyms:
exact_synonym:
Large vacuolated foam cells ('NP cells') on bone marrow biopsy; Large vacuolated foam cells on bone marrow biopsy