Intravascular Lymphoma with NK Cell Immunophenotype

Intravascular Lymphoma is a rare extranodal large cell lymphoma characterised by a neoplastic proliferation of lymphoid cells in small vessel lumina typically involving the skin and central nervous system. The malignant cells are most commonly of B cell origin, although rare T cell variants have been described. We report a rare case of intravascular lymphoma with an NK cell phenotype. The patient is a 65 year‐old man with a 5 year history of hypogammaglobulinemia and a six month history of tinea corporis involving the legs. Following topical antifungal treatment.asymptomatic erythematous plaques were noted on the lower extremities. A skin biopsy revealed intravascular thrombi with atypical malignant lymphoid cells which were immunoreactive for: CD3, CD2, LCA, CD56, perforin, granzyme B, and TIA‐1. There is one description of an NK‐like intravascular lymphoma in the literature and one of the authors (G.P.) has recently described two patients with intravascular lymphoma of definitive NK cell type (submitted for publication). Intravascular lymphoma is an aggressive malignancy with a poor prognosis. Recognition of this newly described variant will help to elucidate our understanding of its pathogenesis and natural history.