Primary subcutaneous follicular centre cell lymphoma with involvement of the galea: a case report and short review of the literature.

Primary cutaneous follicular centre cell lymphoma (FCCL) is a distinct subtype of cutaneous lymphoma that originates from germinal centre cells. Histologically, the disease is typified by a bottom-heavy infiltrate with a diffuse or follicular growth pattern situated in the mid or deep dermis. In some cases, the neoplastic infiltrate may involve the underlying subcutaneous tissue, but so far primary subcutaneous FCCL has not been reported. We report the first case of primary FCCL located primarily in the deep subcutis with extension into the galea and review the literature on primary subcutaneous B-cell lymphomas.