primary cutaneous diffuse large B-cell lymphoma, Leg type (Monarch Disease Ontology term MONDO_0006383) is an aggressive primary cutaneous B-cell lymphoma, usually involving the lower leg. It is composed of a generally monotonous proliferation of immunoblasts, or less frequently centroblasts, with few admixed reactive cells. This type of lymphoma occurs most often in elderly women who present with rapidly growing tumors, usually on one or both legs. Dissemination to extracutaneous sites is frequent. Treatment with combination chemotherapy is usually required. Also known as: PCDLBCL,LT.