Introduction::Verrucous carcinoma is a rare variant of squamous cell carcinoma. It generally grows exogenously and bone erosion is rare. Here we present a case of verrucous carcinoma on the foot with toe absence.Case presentation::A 64-year-old man presented with a 6-year history of a slowly growing exogenous hyperkeratotic verrucous lesion on the right fifth toe, which had been absent for 1 year. Before the lesion appeared, he had undergone nail extraction on this toe. The culture of fungi and mycobacteria were negative. Three-dimensional computed tomography showed that the fifth toe of the right foot was absent. Histopathological examination showed that the lesion was exogenous and verrucous and exhibited moderate keratinocyte hyperplasia. Combined with clinical manifestation and histopathological examination, verrucous carcinoma is suggested. The lesion was surgically excised, and the patient was followed up for more than 6 months without recurrence.Discussion::Verrucous carcinoma is an exophytic tumor with verrucous growth at the beginning, which can invade deep tissues and even cause limb mutilation. When encountering a patient with a wart-like plaque on the foot that responds poorly to conventional treatments, clinicians should maintain a high degree of clinical vigilance and a low threshold for biopsy.Conclusion::We observed a rare outcome of toe absence associated with verrucous carcinoma. Therefore, early diagnosis of verrucous carcinoma is very important. Surgical excision is an effective treatment at present. Extensive resection is usually required to avoid recurrence.

verrucous carcinoma;squamous cell carcinoma;surgical excision;case report

Zheng Xiao-Li;Yi Fei;Jiang Yi-Qun;Wang Qian-Qiu;Liang Guan-Zhao;Yin Yue-Ping;Zhang Guo-Yi

Department of STD Clinical Management and Intervention, National Center for Sexually Transmitted Disease Control, Hospital for Skin Diseases (Institute of Dermatology), Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu 210042, China;Department of Dermatology, Institute of Dermatology, Peking University Shenzhen Hospital, Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center, Shenzhen 518036, China;Department of Pathology, Chinese Center for Disease Control and Prevention, Hospital for Skin Diseases (Institute of Dermatology), Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu 210042, China;Department of Mycology, Chinese Center for Disease Control and Prevention, Hospital for Skin Diseases (Institute of Dermatology), Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu 210042, China;STD Reference Laboratory, Chinese Center for Disease Control and Prevention, Hospital for Skin Diseases (Institute of Dermatology), Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu 210042, China;Outpatient Department, Hospital for Skin Diseases (Institute of Dermatology), Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu 210042, China.

国际皮肤性病学杂志（英文）

[1]Zheng Xiao-Li;Yi Fei;Jiang Yi-Qun;Wang Qian-Qiu;Liang Guan-Zhao;Yin Yue-Ping;Zhang Guo-Yi-.Toe Absence Related to Verrucous Carcinoma)[J].国际皮肤性病学杂志（英文）,2022(02):113-115

Verrucous,hyperkeratotic,exophytic,mutilation,wart

Toe,Absence,Related,Carcinoma,Introduction,carcinoma,rare,variant,squamous,cell,It,generally,grows,exogenously,bone,erosion,Here,case,verrucous,foot,toe,absence,Case,presentation,year,presented,history,slowly,growing,lesion,right,fifth,which,had,been,absent,Before,appeared,undergone,nail,extraction,this,culture,fungi,mycobacteria,were,negative,Three,dimensional,computed,tomography,showed,that,was,Histopathological,examination,exhibited,moderate,keratinocyte,hyperplasia,Combined,clinical,manifestation,histopathological,suggested,surgically,excised,patient,followed,up,more,than,months,without,recurrence,Discussion,tumor,growth,beginning,can,invade,deep,tissues,even,cause,limb,When,encountering,like,plaque,responds,poorly,conventional,treatments,clinicians,should,maintain,high,degree,vigilance,threshold,biopsy,Conclusion,We,observed,outcome,associated,Therefore,early,diagnosis,very,important,Surgical,excision,effective,Extensive,resection,usually,required,avoid,report

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