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- W39489322 abstract "A 25-year-old woman (gravida 1, para 1) presented with pelvic pain. A pelvic ultrasound demonstrated a 12 cm × 13 cm complex mass in the right adnexa, suggesting a large dermoid cyst. Preoperative serum human chorionic gonadotropin (hCG) was negative. She underwent a laparotomy and right ovarian cystectomy. The ovarian cyst was as described below:Fetiform teratoma (homunculus) is a term that has been given to a rare form of teratoma that resembles a malformed fetus. There are very few reported cases of this entity in the English-language literature. This tumor must be distinguished from both fetus in fetu (a parasitic monozygotic twin usually found inside the body of a newborn or infant) and an ectopic pregnancy.Mature cystic teratomas are common benign ovarian tumors that occur most frequently in women of reproductive age. The majority are composed of disorganized, neoplastic, mature tissues of 1 or more of the embryonic germ layers: ectoderm, mesoderm, and endoderm. Rarely, these tumors develop a high degree of differentiation and organization, resembling a malformed fetus (fetiform structure). It has been proposed that fetiform teratoma and fetus in fetu can be differentiated based on zygosity. Most ovarian teratomas are homozygous at loci where the host normal tissue demonstrates heterozygosity, but fetus in fetu is genetically identical to its host.Fetiform teratomas must also be distinguished from ectopic pregnancies. All reported cases of fetiform teratoma are composed of mature tissue and present without placental or trophoblastic tissue. A clinical history of an elevated β-hCG level and the documentation of chorionic tissue can substantiate the diagnosis of an ectopic pregnancy.1" @default.
- W39489322 created "2016-06-24" @default.
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- W39489322 date "2008-01-01" @default.
- W39489322 modified "2023-09-23" @default.
- W39489322 title "Fetiform teratoma (homunculus)." @default.
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