Gastrointestinal Pathology: Sacro-coccygeal Teratoma
A full-term foetus shown in sagittal section. The anus is displaced forwards by a globular tumour measuring four inches in diameter, which lies between it and the coccyx, and projects from the perineum. The rectum is stretched over the upper aspect of the mass, whilst the rest of its surface is covered by the perineal skin, which is oedematous in its lowest part. The tumour is strictly encapsulated, and but loosely attached to the surrounding structures. In consistence it is soft, and its cut surface is beset with numerous small cysts. Histologically: a variety of structures - the cysts are lined by columnar epithelium of which three different types occur, and the matrix is composed of loose fibrillary tissue in which are numerous masses of hyaline cartilage.