ABSTRACT
Introduction: Cutaneous epidermal cysts are common lesions, but fortunately, malignant transformation of their epithelium is rare. There are only a few cases mentioned in recent literature, mostly occurring in epidermal cysts in the head and neck region.
Clinical Picture: We present a case of malignant transformation in a long-standing buttock epidermal cyst, presenting a month after trauma to the cyst. Treatment: An excision biopsy and rotation flap was done. When the pathology was confirmed, a second resection was carried out and the defect covered with a free latissimus dorsi flap, a buttock rotation flap and a posterior thigh rotation flap. Conclusion: Although malignant transformation is rare, this case illustrates the importance of routine histology in excision of epidermal cysts.Epidermal cysts are common benign subcutaneous lesions. Malignant transformation in epidermal cysts is a rare but recognised occurrence.
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