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