[2 cases of granular cell tumor of the breast].

Two cases of granular cell tumor of the breast are reported. This disease is uncommon; only 54 cases have been reported so far. Clinically, it resembled breast cancer. Its palpation is solid. It sometimes has a dimpling sign, and, on occasion, the X-ray diagnosis shows a spicule. Pathologically, the tumor has a tendency to infiltration. The tumor cells contain granules of different sizes. Straited muscles, mesenchymal cells and Schwann's cells have been pointed out as possible roigins of the tumor. It has also been explained as histiocytic granuloma. A decisive theory about its organic development, however, has yet to be established.