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      Nodulocystic Basal Cell Carcinoma Arising Directly from a Seborrheic Keratosis: A Rare Case Report

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          Abstract

          Seborrheic keratoses (SKs) are common epidermal tumors composed of benign keratinocytes. Malignant skin tumors including basal cell carcinoma (BCC) rarely arise within SKs. We report a rare case of an 82-year-old man with nodulocystic BCC that appeared at the center of a scaly hyperpigmented SK that had been presented for more than 10 years. It was histologically confirmed that CK19-positive BCC arose directly from the wall of the pseudohorn cyst, a part of the SK. Nodular and/or cystic BCC also rarely arise within SKs while the most common histologic type of BCC within SKs is the superficial type. Careful observation of SKs is important even though it is rarely a background condition for malignant transformation.

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          Most cited references9

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          Seborrhoeic keratoses with associated lesions: a retrospective analysis of 85 lesions.

          John Lim (2006)
          Seborrhoeic keratoses are benign epidermal neoplasms that are rarely associated with other skin lesions especially malignancies. In this study, the aim was to assess the incidence of associated lesions occurring either adjacent to or contiguous with a seborrhoeic keratosis. A retrospective case series over a 12-month period was carried out. In total, 639 consecutive histologically diagnosed seborrhoeic keratoses were identified, of which 85 (9%) were found to be associated with other lesions. Of these associated lesions, 44 (7%) were malignant, with four of these found to be arising within the seborrhoeic keratosis. These associated lesions included premalignant lesions, malignancies, melanocytic lesions and miscellaneous lesions. Men (59%) were affected more commonly than women. The average age was 74 years (range 33-98 years). Seborrhoeic keratoses associated with other lesions were found most commonly on the head and neck. The incidence of associated lesions, in particular malignancy arising within seborrhoeic keratoses may be higher than previously thought. This may be an incidental phenomenon, or seborrhoeic keratosis could represent a precursor lesion. Therefore, seborrhoeic keratoses that have undergone recent clinical change should be considered for biopsy and histological examination.
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            Keratotic basal-cell carcinoma arising from an epidermoid cyst.

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              Basal cell carcinoma arising from epidermoid cyst: a case report.

              Cutaneous epidermoid cysts are very common lesions, but neoplastic transformation of their epithelium is extremely rare. We describe a patient with basal cell carcinoma arising in the wall of an epidermoid cyst present on the back for 20 years. We emphasize the advisability of a close histologic examination of all cutaneous cysts that are seemingly benign in order to avoid incorrect diagnosis.
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                Author and article information

                Journal
                Indian J Dermatol
                Indian J Dermatol
                IJD
                Indian Journal of Dermatology
                Medknow Publications & Media Pvt Ltd (India )
                0019-5154
                1998-3611
                Jul-Aug 2016
                : 61
                : 4
                : 443-445
                Affiliations
                [1] From the Department of Dermatology, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
                Author notes
                Address for correspondence: Dr. Naoko Okiyama, Department of Dermatology, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan. E-mail: naoko.okiyama@ 123456md.tsukuba.ac.j
                Article
                IJD-61-443
                10.4103/0019-5154.185720
                4966407
                27512194
                665d572b-1bc8-4eac-bfa9-07bd1091ac6f
                Copyright: © Indian Journal of Dermatology

                This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as the author is credited and the new creations are licensed under the identical terms.

                History
                : November 2015
                : March 2016
                Categories
                Case Report

                Dermatology
                basal cell carcinoma,ck19,pseudohorn cyst,seborrheic keratosis
                Dermatology
                basal cell carcinoma, ck19, pseudohorn cyst, seborrheic keratosis

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