Prenatal and postnatal MRI imaging findings of intracranial parasitic fetus: a case report
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CASE REPORT
Prenatal and postnatal MRI imaging findings of intracranial parasitic fetus: a case report Kai Zhu 1 Received: 28 June 2020 / Accepted: 16 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Fetus in fetu (FIF) is an extremely rare anomaly. It is predominantly seen retroperitoneally in 80% of cases but can present at atypical sites like the skull, sacrum, scrotum and the mouth. We reported a rare case of intracranial parasitic fetus. We described the prenatal and postnatal MRI findings of the case. There was no obvious spinal signal on the imaging findings at 35 weeks of gestation. However, the postnatal MRI revealed spinal column signal at 5 months and 11 days. Keywords Fetus in fetu . Intracranial mass . Intratumoral mass
Introduction Fetus in fetu (FIF) is a rare condition where a monozygotic diamniotic parasitic twin is incorporated into the body of its fellow twin and grows inside it [1]. FIF has been defined as “an encapsulated, pedunculated, vertebrate”, fetiform mass located within a basically normal fetus, either immediately adjacent to one of the sites of attachment of conjoined twins or with the neural tube or the gastrointestinal system (or a derivative thereof). A teratoma consists of a chaotic mixture of microscopically identifiable tissues, rarely with more differentiation than a well-formed tooth or a portion of the intestine [2]. The commonly accepted theory is that it results from an abnormal monozygotic diamniotic twin pregnancy in which pluripotent cells [3, 4] of the inner cell mass (ICM) of one twin are incorporated into the body of the other twin. Recently, popularity of fetal MRI has increased due to development of ultrafast MRI pulse sequences allowing minimal image degradation due to fetal motion. MRI is considered safe in pregnancy as there is no known adverse biological effect on the fetus in utero. MRI has many advantages such as inherent high tissue contrast, multiplanar capability and choice of various pulse sequences. MRI may be used to illustrate more details [5]. MRI has emerged as an excellent alternate safe
* Kai Zhu [email protected] 1
Department of Radiology, Harbin Children Hospital, Harbin 150010, People’s Republic of China
technique in evaluation of FIF. As far as we know, the complete MRI findings of intracranial parasitic fetus prenatal and postnatal delivery have not been reported. In this paper, we report a case of intracranial parasitized fetus with prenatal and postnatal MRI.
Case report Prenatal data A 26-year-old, gravida 1 para 0 woman was referred for routine obstetric ultrasound scan and suspected fetal intracranial teratoma at 35 weeks of gestation (the gestational weeks were calculated from the first day of the last menstruation). The family history was negative for congenital malformations, and there was no history of medication and drug use during pregnancy. The biometry measurements were appropriate for gestation age. At 28 weeks of gestation, a previous ultrasound examination was considered as normal; i
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