Background: Foetal anomaly scan is usually carried out between 18 to 24 weeks of pregnancy. This is an ultrasound scan and looks for structural anomalies in the foetus so that parents can be informed about the consequences arising from continuity of pregnancy. Parents have the choice to discontinue or improve the safety of birth. Aims and objectives: To study the common structural abnormalities detected by routine ultrasound examination at 18 to 24 weeks of gestation.Methods:The retrospective observational study was conducted at Silchar Medical College and Hospital on 30 cases of congenital malformation from June 2016 till March 2018.Foetal anomaly scan was done on 3000 women in second trimesterofpregnancy.Results: The results of anomaly scan showed that out of 3000 pregnant women between 18 to 24 weeks, 30 pregnant women (1%) had foetal structural anomalies. Out of them, 13 were primigravida and 17 were multigravida. 99% women showed no foetal anomaly.Conclusion: Prenatal diagnosis of congenital anomalies provides information for decisions during pregnancy and appropriate treatment perinatally and it is assumed to improve perinatal and long term outcome.