Subcutaneous panniculitis-like T-cell lymphoma with macrophage activation syndrome treated by cyclosporine and prednisolone.

Subcutaneous panniculitis-like T-cell lymphoma (SPTCL; α/β T-cell subtype) is a distinct variantof cutaneous T-cell lymphomas, which presents as inflammatory subcutaneous nodules. A 17-year-old male presented with recurrent fever with concomitant facial swelling, pedal edema, hepatosplenomegaly, and mildly tender subcutaneous plaques in generalized distribution along with patches of scarring alopecia on scalp. There were features of macrophage activation syndrome in the form of hemophagocytosis in the bone marrow, pancytopenia, high serum lactate dehydrogenase levels, low fibrinogen clotting activity, prolonged activated prothrombine time (aPTT), increased serum ferritin, hypoalbuminemia, and hypertriglyceridemia. Histopathology showed lobular panniculitis-like infiltration by atypical lymphocytes rimming the adipocytes. Immunohistochemistry revealed positive CD3 and CD8 markers, whereas CD4, CD56, and CD20 were negative, consistent with the diagnosis of α/β type of SPTCL. Treatment with oral prednisolone (1mg/kg/day) and cyclosporine (2mg/kg/day; 100 mg) led to rapid subsidence of fever, plaques, and abnormal hematological parameters within a few weeks.