Cutaneous diffuse large B-cell lymphoma of the leg associated with chronic lymphedema.

Development of malignant tumors is a rare but well known complication in chronic lymphedema (CL). We report herein a cutaneous diffuse large B-cell lymphoma of the leg associated with CL. An 89-year-old man presented with multiple cutaneous lesions on his right limb that showed a CL. Dermatological examination disclosed multiple violaceous, firm, slightly infiltrated nodules on the anterior aspect of the leg and the dorsum and sole of the foot. A biopsy of one nodule of the leg disclosed a diffuse large B-cell lymphoma, type of the legs. There was no evidence of lymphadenopathy on computed tomography (CT) scans of the chest, abdomen, and pelvis. A bone marrow aspiration and biopsy showed normal results. The patient was treated with local radiotherapy at a dose of 40 Gy, obtaining a highly significant, almost complete, clinical remission. A literature search identified 11 additional cases of primary cutaneous lymphoma associated with CL. An inadequate lymphatic drainage may make the lymphedematous region an immunologically vulnerable area, predisposing to neoplasia.