case_images: PMC5279087_01
case_images: Mass (5 cm x 5 cm) with volcanic-like ulcer in the right buttock.
case_images: medi-96-e5857-g001.jpg
case_images: PMC5279087_01_medi-96-e5857-g001.jpg
case_images: F1
case_images: Physical examination revealed a 5 cm x 5 cm mass in the right buttock with crateriform ulcer and stinky purulence on the top (Fig. 1).
case_images: Second biopsy of the mass showing well-differentiated SCC. Hematoxylin and eosin x100.
case_images: medi-96-e5857-g002.jpg
case_images: PMC5279087_01_medi-96-e5857-g002.jpg
case_images: F2
case_images: Second biopsy demonstrated verrucous carcinoma (a highly differentiated SCC) (Fig. 2), immunohistochemistry results showed negative human papillomavirus (HPV), p16 expression and high Ki67.
case_images: Defection left after radical excision of the lesion in the right buttock.
case_images: medi-96-e5857-g003.jpg
case_images: PMC5279087_01_medi-96-e5857-g003.jpg
case_images: F3
case_images: During operation frozen pathologies of resection margin in the direction of 3, 6, 9, 12 o'clock showed tumor free (Fig. 3).
case_images: Wound covered by split-thickness skin grafting healed well after applying topical negative pressure for a week.
case_images: medi-96-e5857-g004.jpg
case_images: PMC5279087_01_medi-96-e5857-g004.jpg
case_images: F4
case_images: Later, reconstruction with split-thickness skin grafting from lateral thigh was conducted, the skin grafting healed primarily under careful observation (Fig. 4).