RT Journal A1 Vidyarthi SC T1 GRanular cell myoblastoma of the breast JF Archives of Surgery JO Archives of Surgery YR 1969 FD May 1 VO 98 IS 5 SP 662 OP 667 DO 10.1001/archsurg.1969.01340110154023 UL http://dx.doi.org/10.1001/archsurg.1969.01340110154023 AB Granular cell myoblastoma, whether a misnomer or not, is a well-established entity of the medical literature. It occurs widely in the body. Its occurrence in the breast, though infrequent, is of great significance because of its clinical similarity to carcinoma. Only rarely a correct diagnosis is made clinically. Histological diagnosis is easy though diagnosis in a frozen section has been found to be simple by some1 and not so easy by others.2 Knowledge of the tumor and experience is thus important in avoiding errors in diagnosis.About 6% of granular cell myoblastomas occur in the breast.3 A review of the literature has revealed 49 documented cases (Table). The present paper reports three additional cases which illustrate some of the difficulties involved in the diagnosis.Report of Cases  Case 1.—A 55-year-old Negro laundress was admitted to the Philadelphia General Hospital on Feb 23, 1965, with a mass in the