Cystic abdominal masses are relatively common in neonatal period. Among all cystic abdominal masses in neonatal period; mesenteric and ovarian cysts are more common, whereas hemorrhagic cysts are very rare. During pregnancy, hemorrhagic cysts may be occured due to blunt trauma such as motor vehicle accidents, accidental falls, and violence. Forthyone-day-old girl was admitted to our clinic with an intraabdominal cyst located in the right ovarian region; which was detected by antenatal ultrasonography,. The postnatal MRI revealed a heterogeneous cystic mass (50x30x30 mm) located in the pelvis. Her mother was exposed to blunt abdominal trauma as domestic violence at her 5th gestational month. The mass was easily removed since it just had a little connection to the mesentery of descending colon. It was thought that the hematoma on the mesentery of colon caused by the maternal trauma. Both ovaries and kidneys had normal appearance. Fortunately, the hematoma did not impair vascularization of the colon or other intraabdominal organs and it only turned into a simple hemorrhagic cyst. The histopathologic examination of the mass was reported as a hemorrhagic and necrotic simple cyst.Ultrasonography is the method of choice for fetal masses during antenatal period. These masses may need to be evaluated by the abdominal MRI after delivery. Some fetal masses may be associated with blunt trauma during pregnancy as seen in our case. Consequently, the medical history of the mother should be carefully obtained in terms of trauma and domestic violence. To the best of our knowledge, neonatal hemorrhagic cyst due to antenatal blunt trauma was not reported in the literature so far

Keywords: Intrauterine, trauma, hemorrhagic cyst, domestic violence