Abstract
Extraskeletal chondroma is a benign cartilage nodule or mass independent of bone. It generally affects the soft tissue of the hands and feet, and those arising from the trunk are rare. We herein report a case of extraskeletal chondroma of the abdomen. A 36-year-old male patient presented with an asymptomatic nodular tumor on the right side of the abdomen. The patient had not noticed any growth since he first noticed the tumor 1 month earlier. Clinical examination revealed a 1-cmdiameter, hard, smooth, fixed tumor of the abdomen. He had no history of trauma. The lesion was surgically removed. The tumor was situated within the adipose tissue, and the bottom was partly adhered to the fasciae. Histopathologically, the tumor was encapsulated by a thin, fibrous connective tissue and comprised chondrocytic tumor cells. Lacy basophilic mineral deposits around the tumor cells were also seen. The matrix was Alcian blue-positive. Immunohistochemically, the tumor cells were positive for S-100 protein. A diagnosis of extraskeletal chondroma was established. To our knowledge, this is the ninth case of extraskeletal condroma located in the trunk in Japan. Extraskeletal chondroma occurred in the trunk may not be common in daily dermatological practice.
