title: Cutaneous-malignancy and leprosy. Report of a patient with Mycobacterium leprae and basal cell carcinoma concurrently present in the same lesion.
abstract: BACKGROUND
  Leprosy is a chronic systemic infection caused by the bacillus Mycobacterium leprae. Cutaneous neoplasms have been observed in patients with leprosy. Also, albeit less commonly, M. leprae have been documented in the lesions of skin cancer.
  
  
  OBJECTIVE
  To describe a 62-year-old man with chronic sun exposure and exposure to armadillos who subsequently developed lepromatous leprosy, to discuss the cutaneous malignancies that have occurred in patients with leprosy, and to review the literature concerning the concurrent presence of an infectious pathogen and a cutaneous neoplasm in the same lesion.
  
  
  METHODS
  Our patient's basal cell carcinomas were excised, his abdominal plaques were biopsied, and his leprosy infection was treated with dapsone and rifampin. The types of cutaneous malignancies in leprosy patients and infectious pathogens concurrently found in lesions of skin tumors were summarized after evaluating previously published reports.
  
  
  RESULTS
  Skin biopsies from our patient demonstrated M. leprae bacilli not only in his abdominal plaques, but also in all of his basal cell carcinoma lesions. Fungal, mycobacterial, and viral pathogens have concurrently been observed in skin lesions of basal cell carcinomas, Kaposi's sarcoma, melanoma, mycosis fungoides, and squamous cell carcinoma.
  
  
  CONCLUSIONS
  Patients with leprosy can develop skin cancers and the histologic interpretation of those skin cancers can show evidence of leprosy. It is uncertain to what degree the decreased cell-mediated immunity in patients with lepromatous leprosy either enhances their susceptibility to and/or influences the course of their cutaneous neoplasms; also, in these patients, the coexistence of M. leprae organisms and cutaneous malignancy in the same lesion is likely to be secondary to the high bacillary load that is present.
authors.affiliation: Department of Dermatology, University of Texas Medical School, Houston 77030.
authors.forename: S L
authors.initials: SL
authors.lastname: Ratoosh
authors.forename: P R
authors.initials: PR
authors.lastname: Cohen
authors.forename: P
authors.initials: P
authors.lastname: Troncoso
mesh_terms: D000005:Abdomen / Q000473:pathology; D002280:Basal Cell Carcinoma / Q000150:complications* / Q000382:microbiology / Q000473:pathology; D005500:Follow-Up Studies; D006258:Head and Neck Neoplasms / Q000150:complications* / Q000382:microbiology / Q000473:pathology; D006644:Histiocytes / Q000473:pathology; D006801:Humans; D015440:Leprosy, Lepromatous / Q000150:complications* / Q000382:microbiology / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009166:Mycobacterium leprae / Q000302:isolation & purification; D012878:Skin Neoplasms / Q000150:complications* / Q000382:microbiology / Q000473:pathology