'Lennert's lymphoma' of the nose

An 85-year-old male patient presented with a left-sided nasal obstruction of one year's duration. Histology of the tumour revealed cluster of epitheloid histiocytes scattered among immature lymphoid cells (lymphoblasts). Immunological studies of the tumour revealed a polyclonal (B cell) pattern in only a small proportion of the lymphoid cells. A T-cell origin is proposed. The histiocytes showed intense positivity when stained for muramidase. Wide local excision of the tumour was performed and the patient remains well and free of symptoms five months post-operatively.