Because of the rarity of the condition, the following case of congenital anococcygeal cyst is reported.
REPORT OF A CASE
S., a newborn girl, delivered by Dr. Charles S. Wachs on Dec. 29, 1940, had an unusual anomaly. Projecting from the anococcygeal region was a large sac covered by skin. The anus was relatively small but intact; the sphincter ani responded to external stimulation, and the bowels moved normally. From the posterior anal margin and from the area 1 cm. to the right and 2 cm. to the left of the anus the skin projected away from the body to form the anterior wall of the neck of the sac. The skin from the sacral region and the medial aspect of the buttocks formed the posterior and lateral walls. The neck of the sac was 2 cm. long, and from it the skin ballooned out to form a sac 13
LORENZ H. ANOCOCCYGEAL CYST. Am J Dis Child. 1941;62(1):130-132. doi:10.1001/archpedi.1941.02000130141011