SEER is an authoritative source of information on cancer incidence and survival in the United States. SEER currently collects and publishes cancer incidence and survival data from population-based cancer registries covering approximately 28 percent of the U.S. population.
This is a disease composed of a clonal proliferation of mature, activated gamma-delta T-cells with a cytotoxic phenotype. This group includes cases previously known as subcutaneous panniculitis-like T-cell lymphoma with a gamma-delta phenotype.
(This code is effective for cases diagnosed 2010 and later. For cases diagnosed prior to 2010, see codes 9702/3 or 9709/3.)
1. Epidermorphic with presentation of patches and/or plaques. 2. Deep dermal or subcutaneous tumors with or without epidermal necrosis and ulceration. 3. Dissemination to mucosal or extranodal sites. Involvement of lymph nodes, spleen, or bone marrow is uncommon.
Resistant to multiagent chemotherapy and/or radiation and has a poor prognosis. Patients with subcutaneous involvement tend to have a more unfavorable prognosis.