Clear cell leiomyoma cells are similar to CCMMT clear cells and smooth muscle spindle cells, and have comparable positive expression of SMA; however, CCMMT cells have a lighter nucleus, its entire cytoplasm appears clear, vacuoles in some cells compress the nucleus and show a signet ring shape, and the epithelioid cells all exhibit a funicular distribution. This evidence concerns the gene SMN1 and leiomyoma.