Interestingly, a similar phenomenon was observed in this case. Regular hairpin vessels are seen in seborrheic keratosis. 1,5 This melanoma was accompanied by senile lentigo, which can be the precursor of seborrheic keratosis. It may be one of the possible mechanisms by which regular hairpin vessels become conspicuous by melanoma. Recently, black-blue color has been reported to be an important dermoscopic clue to recognize nodular melanoma. 2 However, black-blue color was uncertain probably because this case was hypomelanotic melanoma and such a confusing case still may exist. We should keep in mind that typical dermoscopic features of pigmented basal cell carcinomas can be found in melanomas.
Verrucous carcinoma (VC) is an uncommon, distinct type of well-differentiated squamous cell carcinoma. Here we present two cases of VC, one arising from the lower leg and the other from genital skin.Case 1, a female patient, aged 95 years, had a brownish verrucous plaque on her right lower leg. Histopathologically, epithelial tumor cells grew pushing the stroma, while the basement membrane was intact. No prominent cellular atypia or hyperchromatin was found. Case 2, a male patient, aged 53 years, had a verrucous plaque at the border between his scrotum and inner aspect of his thigh. A pathological diagnosis of VC was made using an excisional specimen. Making a definitive diagnosis of VC is challenging but crucial. Pathological diagnosis using a small specimen might cause underdiagnosis or overdiagnosis. To avoid this, pertinent pathological diagnosis using an ample specimen is required. We also revisited the definition of VC to precisely understand its nature. (J Nippon Med Sch 2018; 85: 47 50)
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