[Development of adenocarcinoma in a retrorectal pre-sacrococcygeal hamartoma].

Among the different pathologic structures of the presacrococcygeal space retrorectal cystic hamartomas are uncommon lesions. These cysts are most likely derived from remnants of the embryonic tailgut although an association to teratomas may exist. We describe the clinicopathologic features of a retrorectal cystic hematoma with malignant transformation in a 60 year old female patient. The literature is reviewed and etiology, diagnosis and operative management are discussed.