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PRENATAL DIAGNOSIS OF A LARGE PLACENTAL CYST WITH INTRACYSTIC HEMORRHAGE

PRENATAL DIAGNOSIS OF A LARGE PLACENTAL CYST WITH INTRACYSTIC HEMORRHAGE. A. ANDOLSI, N. BOUCHNAK, L. BEN HASSINE, S. BEN DHIA, L. LAHMAR, H. LOUATI, W. DOUIRA, I. BELLAGHA PEDIATRIC Radiology department, Béchir Hamza Children’s Hospital, Tunis, Tunisia. OB8. OBJECTIVES.

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PRENATAL DIAGNOSIS OF A LARGE PLACENTAL CYST WITH INTRACYSTIC HEMORRHAGE

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  1. PRENATAL DIAGNOSIS OF A LARGE PLACENTAL CYST WITH INTRACYSTIC HEMORRHAGE A. ANDOLSI, N. BOUCHNAK, L. BEN HASSINE, S. BEN DHIA, L. LAHMAR, H. LOUATI, W. DOUIRA, I. BELLAGHAPEDIATRIC Radiology department, BéchirHamza Children’s Hospital, Tunis, Tunisia OB8

  2. OBJECTIVES

  3. Subchorionic placental cysts are quite rare, and their etiology remains controversial. In some cases, they are associated with fetal growth restriction and intrauterine asphyxia. • In this work, we describe a case of a large subchorionic cyst arising near the placental cord insertion site, complicated by an intracystic hemorrhage and diagnosed by ultrasound.

  4. CASE REPORT

  5. An 18-year-old gravida 1 para 1 woman presented at our institution at 23 weeks of gestation for a routinely obstetrical ultra-sound examination. • This patient had no past medical history, except a small constitution.

  6. Ultrasonographic examination performed revealed a harmonious fetal growth restriction with a biometry corresponding to -2SD. • However, limbs and amniotic fluid index were normal for the term. • A large cystic structure measuring 85 mm was found near the placental cord insertion site (figures 1 and 2).

  7. The intracystic contain was heterogeneous and hyperechoic, due to intracystic hemorrhage. • Blood flow was not detected in the cystic structure on color Doppler ultrasound. • A Doppler examination of the umbilical, the cerebral and the uterine arteries revealed normal velocity and pulsatility.

  8. Figure 1 : Ultra-soundexaminationat 23 weeks of gestation demonstrating a heterogeneous and hyperechoic cyst in the fetal surface of the placenta (asterisk).

  9. Figure 2 : Hemorrhagicplacentalcyst (asterisk) near the placentalcord (arrow).

  10. DISCUSSION

  11. DEFINITION • Cystic masses arising from the fetal surface of the placenta have been referred to by different terms, including “subchorionic cysts,” “chorionic cysts,” “subamniotic cysts” and “membranous cysts”. Their etiology remains controversial. • The majority of them are usually smaller than 2 cm in diameter and tend to occur in women with diabetesmellitus or maternalrhesusincompatibility. Our patient had none of these conditions.

  12. ANATOMOPATHOLOGY • Microscopically, the walls in these cysts appear to consist of amniotic and chorionic membranes. It has been suggested that X cells (trophoblastic cells having a secretoryactivity) may be associated with the formation of these cysts. • X cells can be found near areas of fibrinoid degeneration and within the lining of the cystic wall.

  13. IMAGING • Sonographic examination indicates that non complicated subchorionic cysts occur as echo-free cavities under the fetal plate. • There is no blood flow within these lesions. Therefore, they do not induce a Doppler signal. These features were found in our case. • Intracystic hemorrhage leads to an increasing size and a heterogeneous and hyperechoic contain of the cyst.

  14. CLINICAL OUTCOME (1) • There are contradictory opinions concerning the clinical importance of subchorionic cysts. • Most of them have been reported to be of no clinical importance. • Conversely, someauthorsreportedan association with intrauterine growth restriction.

  15. CLINICAL OUTCOME (2) • Fetalgrowth restriction appears to be more frequent in case of large and multiples cysts. • The relationship between placental cyst and placenta vessel is variable. Frequently, fetal chorionic vessels are elevated by these distended cysts, but this usually does not interfere with fetal circulation.

  16. CLINICAL OUTCOME (3) • However, lowbirthweight and abnormal Doppler measurements have been reported for patients with a subchorionic cyst. • Some authors explained that the placental cyst located near the placental cord insertion site causes fetal growth restriction, because it constricts and interferes withumbilicalcord circulation.

  17. MAIN DIFFERENTIAL DIAGNOSES : Subamniotichematomas : • Theyoccuraftera fetal vessel rupture and are usually found beneath the amniotic layer covering the fetal plate of the placenta. • On ultrasonography, they appear as a single mass covered by a thin membrane and protruding from the fetal plate.

  18. Placenta avillousspaces or “placental lakes” : They are located mainly within the placental tissue and are characterized by a turbulent blood flow on real-time ultrasonography. Subchorionic hematomas: They result from bleeding that is maternal in origin. On ultrasonography, they appear as a hypoechoic area between the chorion and the uterine wall.

  19. CONCLUSION

  20. Most subchorionic cysts are thought to be obstetrically harmless. However, a large subchorionic cyst near the placental cord insertion site should be considered a pathological lesion and followed closely by US examination, to rule out a secondary intracystic hemorrhage, a partial occlusion of umbilical cord blood flow, a fetal growth restriction secondary to the cyst or an intraamniotic rupture leading to fetal death.

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