A Statistical Review of Benign Tumors of the Skin for the Past 10 Years

Sung, Ki Young; Kim, Yeong Doo; Kim, Do Won; Chung, Sang Lip

Abstract

We have reviewed the 503 cases of benign skin tumors which were confirmed by histopathological study from January 1977 to July 1987 in the Dermatologic Department of Kyungpook National University Hospital. The result were summarized as follows . l. Among the total of 26,690 dermatologic out patients, 503 cases(1.9%) were diagnosed as having benign skin tumors. The number of benign skin tumors has shown a noticeable increase in the last several years. 2. The tumors were found mainly in ages ranging from the 2nd to 5th decade, most commonly in the 3rd decade(124 cases, 24.7%). 3. Aceording to Lever's elasaification, the tumors were divided into the following 7 groupa . tumors and cyets of the epidermis(35.2%), melanocytic tumors(16.5%), tumors of vaecular tissues(13.3%), tumora of epidermal appendages(11.1%), tumors of fibrous tissue(8.9%), tumors of neura.l tiasue(7.6%) and tumors of fatty, muscular and osseous tiseue(7.4%) in decreasing orders. 4. The 14 common tumors in order of frequency were as follows epidermal cyst (17.l% ),:melanocytic nevus(16.5%), neurofibroma(7.6%), congenital hemangioma(6.4%), nevus sebaceous(6.0%), lipoma(5.2%),seborrheic keratosis(4,8%), linear epidermal nevus(4.6%), steatocystoma mutiplex(2.8%), dermatofibroma(2.6%), hypertrophic scar and keloid.(2.6%), granuloma pyogenicum(2.4% ), keratoacanthoma(2.0%) and syringoma (2,0%). 5. The predilection sites of seborrheic keratosis, keratoacanthoma, syringoma and melanocytic nevus were the face, linear epidermal nevus, dermatofibroma and granuloma pyogenicum were located on the extremities. 6. The duration of tumors from the presumed time of onset to the first visit was within 1 year for epidermal cyst, keratoacanthoma and granuloma pyogenicum, over 10 years for nevus sebaceous, congenital emangioma and neurofibroma. 7. Diagnostic accuracy was higher in melanocytic nevus, congential hemangioma, nevus sebaceous and neurofibroma and lower in steatocystoma multiplex, dermatofibroma, keratoacanthoma, lipoma and epidermal cyst.