somayeh khanjani - Department of Obstetrics and Gynecology, Faculty of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
Sedigheh Borna - Department of Obstetrics and Gynecology, Maternal, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
Razieh Akbari - Department of Obstetrics and Gynecology, Maternal, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
Sara Mirzaeian - Department of Obstetrics and Gynecology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
Nooshin Eshraghi - Department of Perinatology, Shahid Akbarabadi Hospital, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran.
Seyed Javad Nasiri - Department of Pediatric Surgery, Ali-Asghar Children Hospital, Iran University of Medical Sciences, Tehran, Iran.
Maryam Hashemnejad - Assistant Professor, Department of Obstetrics and Gynecology, Faculty of Medicine, Alborz University of Medical Sciences, Tehran, Iran.
Abdolvahab Pourmahmoodian - Department of Pediatric Surgery, Ali-Asghar Children Hospital, Iran University of Medical Sciences, Tehran, Iran.

Background: Lipoblastoma is one of the rare masses in childhood and its diagnosis is very uncommon in the perinatal period, so we reported a case with a diagnosis of this mass during pregnancy. Case Report: In a routine third-trimester ultrasound at ۲۸ weeks, a hyperechoic mass in the size of ۲۷*۳۰mm was detected in between labia majora. However, no abnormal findings were found in perinatal care before this gestational age. Finally, after the birth, at ۴۰ weeks of gestation, the mass was resected and now the baby is in good condition and no recurrence has occurred. There was also an anorectal anomaly associated with this mass in our patient who underwent Anorectoplasty surgery. Conclusion: Due to the rarity of these tumors, it is important to diagnose them in the perinatal period and to investigate other associated anomalies.

Lipoblastoma, perinatal ultrasound, Diagnosis