Squamous Cell Carcinoma of the Bulbar Urethra Accompanied by Lichen Sclerosus: A Case Report.

Squamous cell carcinoma (SCC) of the bulbar urethra accompanied by lichen sclerosus (LS) is rarely reported. This study reports the case of a 56-year-old man with urethral squamous cell carcinoma (USCC) accompanied by a long history of genital LS. The man presented with a painful perineal mass and had a long-term history of urethral strictures and urethral dilatation. The patient developed a periurethral abscess that expanded to the perineum and formed an urethrocutaneousperineal fistula. An organ-sparing perineal resection and fistulectomy was performed according to the patient's wishes. During the operation, residue-like pus mixed with necrotic tissues drained out. A section of the prepuce and the necrotic tissues were sent for histological analysis. Hematoxylin and eosin (HE) staining of the excised prepuce revealed classical LS. HE and immunohistochemical (IHC) staining of the necrotic tissues showed well-differentiated USCC. IHC staining showed the USCC to be positive for P53 and Ki-67 and negative for P16, suggesting the USCC was probably associated with LS. The patient received high-dose chemotherapy and radiation therapy and died 10 months after surgery.