TERATOMAS of the sacral region may be present at birth, lying posterior or anterior to the sacrum. They contain cysts lined by various types of epithelium, dermoids, segments of intestinal mucosa and also gland structures, fat, muscle, cartilage, bone and portions of nerve tissue.
Kiderlen1 reported 74 true teratomas recognized in infancy and childhood gathered from the literature from 1831 to 1898. From 1900 to 1909 Parin2 collected 21 cases, in 6 of which the tumors were malignant. Galletley3 reported a case and reviewed 12 cases from the literature between 1909 and 1922; 3 of the tumors were malignant. Hansmann and Berne4 tabulated 25 cases occurring from 1924 to 1930 and reported their own case; 22 of the 26 cases involved children, and 14 involved females. Since 1930 there have been more than 60 cases reported, including the 6 of Riker and Potts.5
BROWN RK, BROWN EC. SACROCOCCYGEAL TERATOMA WITH URINARY RETENTION. Arch Surg. 1950;60(3):535-542. doi:10.1001/archsurg.1950.01250010554010