title: Squamous cell carcinoma developing within lichen planus of the penis. Treatment with Mohs micrographic surgery.
abstract: BACKGROUND
  Lichen planus is a common disease, with a low malignant potential. There are several case reports in the literature of squamous cell carcinoma (SCC) developing in cutaneous lichen planuse. However, SCC developing in penile lichen planus is extremely rare.
  
  
  OBJECTIVE
  To report a case of SCC developing within penile lichen planus, to discuss treatment with Mohs micrographic surgery, and to review the literature.
  
  
  METHODS
  The diagnosis of lichen planus and SCC were made by biopsy of the lesion.
  
  
  RESULTS
  We present the first case in the English literature of SCC developing within lichen planus of the penis. The lesion was treated with Mohs surgery and the patient's penis is functional and free of tumor 2 years postoperatively.
  
  
  CONCLUSIONS
  Squamous cell carcinoma may develop within lichen planus. Treatment-resistant longstanding cases of lichen planus should be biopsied. Mohs micrographic surgery is a precise treatment for penile SCC, it avoids penectomy, and preserves normal function.
authors.affiliation: Dermatology Division, Washington University School of Medicine, St. Louis, Missouri.
authors.forename: S
authors.initials: S
authors.lastname: Leal-Khouri
authors.forename: G J
authors.initials: GJ
authors.lastname: Hruza
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000473:pathology / Q000601:surgery*; D002471:Cell Transformation, Neoplastic / Q000473:pathology*; D006801:Humans; D008010:Lichen Planus / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D015580:Mohs Surgery; D010409:Penile Diseases / Q000473:pathology*; D010412:Penile Neoplasms / Q000473:pathology / Q000601:surgery*; D012878:Skin Neoplasms / Q000473:pathology / Q000601:surgery*; D016038:Skin Transplantation