Srpski arhiv za celokupno lekarstvo 2016 Volume 144, Issue 5-6, Pages: 334-338
https://doi.org/10.2298/SARH1606334V
Full text ( 562 KB)
Anorectal melanoma and seborrheic dermatitis - a case report
Vekić Berislav (School of Medicine, Belgrade + Clinical Hospital Center „Dr Dragiša Mišović“, Clinic for Surgery, Belgrade)
Živić Rastko (School of Medicine, Belgrade + Clinical Hospital Center „Dr Dragiša Mišović“, Clinic for Surgery, Belgrade)
Kalezić Marko (Clinical Hospital Center „Dr Dragiša Mišović“, Clinic for Surgery, Belgrade)
Otašević Suzana (Faculty of Medicine, Institute of Microbiology, Niš + Center of Microbiology and Parasitology, Public Health Institute, Niš)
Arsić-Arsenijević Valentina (School of Medicine, Belgrade + School of Medicine, Institute of Microbiology and Immunology, National Reference Medical Mycology Laboratory, Belgrade)
Introduction. Anorectal melanoma (ARM) is a rare and aggressive neoplasm with
predisposition for early infiltration, distant spread, and unfavorable
prognosis. It has been speculated that Malassezia yeasts could possibly have
an impact on skin carcinogenesis and development of melanoma, especially in
patients with seborrheic dermatitis (SD), due to production of aryl
hydrocarbon receptor (AhR) agonists. Case Outline. A 52-year-old man with
intensive SD complained of a four-month-long rectal bleeding, tenesmus, pain,
and difficulty during defecation. On examination, a rectal tumor was detected
and histopathology of tumor tissue revealed ARM with positive protein S100,
melanoma antigen HMB45 and melan-A expression. After the diagnosis was
established, abdominoperineal resection of the anus and rectum was performed,
since the tumor was large, obstructive, and the anal sphincter was invaded.
Conclusion. Because of the possible impact of intensive SD to the cross-link
between Malassezia yeasts AhR agonists and skin carcinogenesis, we discussed
on this matter and reviewed the literature data regarding ARM. In addition to
“pathogenic” and “non-pathogenic” Malassezia subtypes based on AhR agonist
production, future studies on Malassezia metabolites, their carcinogenic
effect in the skin and development of melanoma are needed. If the cross-link
between Malassezia AhR agonists and skin carcinogenesis exists, timely
prevention of ARM could be done with Malassezia eradication, especially in
patients with severe SD.
Keywords: anorectal melanoma, cancerogenesis, Malassezia, aryl hydrocarbon receptor, seborrheic dermatitis
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