Abstract
A case of giant nevus with intramuscular tumor was reported. A 5-year-old girl had giant congenital nevus on her trunk and extremities. After five years of Laser treatment, she developed subcutaneous tumor on her left upper back. The tumor was solitary and located under the skin inside latissimus dorsi muscle. The tumor is graycolored, elastic hard in consistency, and nonadhesive to the surrounding tissue. Histopathologically, the tumor consisted of atipical spindle cells with bizarre nuclei. Mitotic figures were also seen. No lymph node structure was recognized and there was no malignant transformation on her giant nevus of the skin. The tumor cells weakly stained with S-100 protein and NSE, however HMB45 was negative. No recurrence has been found for 2 years after the operation. Our tentative diagnosis is malignant melanoma, whith is yet to be proved.
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