title: Difficulties in prenatal diagnosis of tumour in the fetal sacrococcygeal area.
abstract: Prenatal ultrasound at the 20th week of gestation revealed a 3-cm tumour in the sacrococcygeal area. Initially, a sacrococcygeal teratoma was suspected on the basis of fetal ultrasonography, which revealed normal heart anatomy and an increasing tumour mass. The diagnosis was then changed to fetus in fetu or teratoma. Prenatal magnetic resonance imaging at the 34th week of pregnancy confirmed the ultrasound diagnosis. No other anomalies were found. Elective caesarean section was performed at term. The care team included a paediatric surgeon, obstetricians, neonatologists, midwives, and an anesthesiologist. A female newborn was delivered in good condition. The tumour was resected in the operating room and mature teratoma was established by histopathological evaluation. Surprisingly, agenesis of the right forearm was revealed which had not been detected prenatally, despite many examinations (both in our hospital and earlier at a primary care obstetrician office).
authors.affiliation: Obstetrics and Gynecology Department, Polish Mother's Memorial Hospital Research Institute, Łódź, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Krekora
authors.affiliation: Pediatrics and Immunology Department with the Sub-Unit of Nephrology, Polish Mother's Memorial Hospital Research Institute, Łódź, Poland; Prenatal Cardiology Department, Polish Mother's Memorial Hospital Research Institute, Łódź, Poland.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Zych-Krekora
authors.affiliation: Obstetrical Outpatient Clinic,  Ż  ory, Poland.
authors.forename: Marek
authors.initials: M
authors.lastname: Blitek
authors.affiliation: Neonatology Department, Polish Mother's Memorial Hospital Research Institute, Łódź, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Kęsiak
authors.affiliation: Pediatric Surgery and Urology Department, Polish Mother's Memorial Hospital Research Institute, Łódź, Poland.
authors.forename: Anna
authors.initials: A
authors.lastname: Piaseczna-Piotrowska
authors.affiliation: Pathomorphology Department, Polish Mother's Memorial Hospital Research Institute, Łódź, Poland.
authors.forename: Stanisław
authors.initials: S
authors.lastname: Łukaszek
authors.affiliation: Obstetrics and Gynecology Department, Polish Mother's Memorial Hospital Research Institute, Łódź, Poland.
authors.forename: Grzegorz
authors.initials: G
authors.lastname: Krasomski
authors.affiliation: Prenatal Cardiology Department, Polish Mother's Memorial Hospital Research Institute, Łódź, Poland; Fetal Malformations Department, Medical University of Lodz, Łódź, Poland.
authors.forename: Maciej
authors.initials: M
authors.lastname: Słodki
authors.affiliation: Reproduction and Fetus Therapy Clinic, Polish Mother's Memorial Hospital Research Institute, Łódź, Poland.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Szaflik
authors.affiliation: Prenatal Cardiology Department, Polish Mother's Memorial Hospital Research Institute, Łódź, Poland; Fetal Malformations Department, Medical University of Lodz, Łódź, Poland.
authors.forename: Maria
authors.initials: M
authors.lastname: Respondek-Liberska
keywords: Fetus in fetu; forearm aplasia; meningocele; teratoma