Secondary lymph node involvement from primary cutaneous large B-cell lymphoma of the leg: sentinel lymph nodectomy as a new strategy for staging circumscribed cutaneous lymphomas.

BACKGROUND: Primary cutaneous large B-cell lymphoma of the leg (LBCLL) is a recently defined type of non-Hodgkin's lymphoma. It forms a separate category in the new classification of primary cutaneous lymphomas elaborated by the European Organization for Research and Treatment of Cancer. It is associated with a less favorable prognosis than the most frequently occurring types of primary cutaneous B-cell lymphoma. METHODS: The authors present four patients with the typical clinicopathologic constellation of LBCLL. Three of them died during the years 1993-1996. The authors reviewed their courses. The fourth patient was staged by sentinel lymph nodectomy (SLNE), i.e., the selective surgical removal and histologic examination of the first draining lymph node associated with the cutaneous tumor. RESULTS: The courses of the three previous patients were characterized by secondary involvement of regional lymph nodes followed by systemic dissemination of the lymphoma in a third step. Although the conventional staging of the fourth patient had been negative for any extracutaneous lymphoma manifestation, the SLNE revealed initial regional lymph node involvement, which had decisive implications for the choice of therapy. CONCLUSIONS: SLNE may gain a prominent role in the staging of circumscribed cutaneous lymphomas, in addition to its already established position in melanoma management. Further positive effects of SLNE are 1) better distinction of primary cutaneous lymphomas with secondary lymph node involvement from primary lymph node lymphomas with skin manifestation, and 2) better insight into the biology of different primary cutaneous lymphoma types.