Background Prevalence of congenital anomalies varies greatly from country to country. It is reported about 2.5% in India. In India, congenital anomalies are responsible for 15% of perinatal mortality and for 10% to 15% of neonatal deaths. The main aim of the study is to evaluate the prevalence of the congenital anomalies and malformation patterns in our hospital population. Material & Method This is a cross-sectional study carried out in the ‘Radiology unit’ of ‘District Hospital, Gomati’, Tripura. The study population includes about 910 antenatal mothers in the second and third trimester, who were referred to ‘Radiology unit’ from the outpatient and inpatient departments of ‘Obstetrics and Gynaecology’ of the same hospital between September 2017 to February 2018 were included in the study. Data of Antenatal ultrasounds was statistically analyzed on structured data collection form to determine the prevalence of congenital anomaly in 2nd & 3rd trimester. Results: Total 910 numbers of 2nd and 3rd trimester prenatal ultrasonography (USG) were done. Out of these 18 numbers of congenital anomalies were detected. The antenatal prevalence of congenital anomalies was 1.97%. The mean maternal age and mean gestational age at diagnosis was 22.9 years and 27.7 weeks respectively. Genitourinary system defect was the commonest (27.77%), of which maximum number had pyelactasis i.e. 3 (16.66%) cases. Conclusion: Ultrasonography is a cost-effective, non-invasive and sensitive tool in detecting the congenital anomalies antenatally in the hands of an experienced radiologist. Besides the first-trimester USG, the second trimester scan is mandatory in detecting anomaly in the growing foetus, as the majority of congenital anomalies are detected between 20 and 22 weeks of pregnancy
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