Abstract
Leiomyosarcoma of the scrotum is a rare malignant tumour. Cutaneous and subcutaneous leiomyosarcomas constitute the two subtypes. To date, about 40 cases are reported in the English literature. We report a case of cutaneous leiomyosarcoma arising from the dartos muscle in a 64-year-old male. He presented with a pedunculated right scrotal lesion that was gradually increasing in size over the past year. Excision biopsy revealed a malignant smooth muscle tumour which was positive for desmin and caldesmon. Such tumours are often mistaken for a benign lesion because they are generally painless and slow growing. Cutaneous leiomyosarcomas are best treated with wide excision. Long-term follow-up is essential due to the risk of delayed local recurrence and distant metastasis.
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