Malignant mesenchymoma is a rare soft tissue neoplasm showing two or more separate and distinct types of malignant mesenchymal differentiation in addition to an undifferentiated sarcomatous component. Occasional cases of malignant mesenchymoma have been reported in the spermatic cord and paratesticular area. However, documented reports have been seldom found in Korea. We report a case in which there was evidence of lipo-, rhabdomyo-, osteosarcomatous differentiation in the same neoplasm with brief review of the literatures.