“…However, primary cutaneous Hodgkin's disease is rare (Szur et al, 1970;Long, Mihm & Qazi, 1976;Saxe, Kahn & King, 1977), and some even doubt its existence (Brehmer-Andersson, t976). Moreover, when a malignant lymphoma presents as a solitary cutaneous tumour, as in the present patient, the histology may be difficult to interpret (Smith & Levene, 1978), especially as the presence of Reed-Sternberg cells in an infiltrate is not pathognomonic of Hodgkin's disease and similar cells may occur in other malignant conditions (Strum, Park & Rappaport, 1970). The large pleomorphic cells in our patient's tumour were eventually considered to be abnormal plasma cells rather than Reed-Sternberg cells and the diagnosis of plasmacytoid lymphoma (extra-medullary plasmacytoma) was thought to be the correct one.…”