Lymph node FNA, Ziehl-Neelsen staining
Strongly positive for acid-fast bacilli

Presence of many acid-fast bacilli, both intra- and extra-cellular ones, explains the "negative" image (pseudo-Gaucher cells) seen on the M-G-G stained smears. The culture was positive for M. tuberculosis. (The patient was taking oral corticoids for a dermatological condition).
Note: the term pseudo-Gaucher cell is commonly used for the foamy globoid histiocytes/plasma cells seen in the bone marrow of Chronic Myelogenous Leukemia and some lymphomas. May be that we should use pseudo-pseudo-Gaucher for the Mycobaterium loaded ones...