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Sacrococcygeal Teratoma / SCT is a tumor made up of tissues from the three primary layers of cells defined in embryos, or germ layers. Sacrococcygeal Teratoma / SCT appear in the lower back and buttocks. The tumors can grow at an unpredictable rate to very large dimensions and present both inside and outside the fetal pelvis. Some tumors are diagnosed in utero, others at birth.
The cause of Sacrococcygeal Teratoma / SCT is not known.
Though a rare condition (1 in 35,000-40,000 births), Sacrococcygeal Teratoma / SCT is one of the most common tumors in newborns. Females are four times more likely to be affected than males. Malignancies are more frequent in males.
Sacrococcygeal Teratoma / SCT is detected by ultrasound as a mass on the fetal buttocks associated with a uterus larger than it should be at a specific gestational age. The reason for this is often polyhydramnios caused by hyper-filtration of the kidneys due to the high output state these tumors cause. An extremely large Sacrococcygeal Teratoma / SCT can displace the pelvic or abdominal structures of the fetus. Some fetal tumors have been reported as large as 25 cm by 20 cm. Abnormalities of the nervous, cardiac, gastrointestinal, urogenital or musculoskeletal systems may be associated with Sacrococcygeal Teratoma.
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