While the study was underway, 3903 obstetric ultrasound scans were carried out in women in their second and third trimesters. Among these, 72 cases of polyhydramnios (equating to 1.8%) and 63 instances of foetal malformation (1.6%) were identified. The mean age of the patients was 23.6 years with extreme values of 19 and 40 years. These sonograms were conducted in the second trimester in 37 cases (51.4%) and the third trimester in 35 cases (48.6%). In 60 of these cases (83.3%), polyhydramnios was determined using the Chamberlain method with a mean amniotic fluid pocket depth of 157.8 mm. The Phelan method was only used in 12 cases (16.7%). The mean of the AFI was 335 mm. In 81.9% of cases, polyhydramnios was found to be severe, and in 18.1% of cases, it was moderate. In 55 cases (76.4%), polyhydramnios was associated with foetal malformation. In 33 cases (60%), these were major foetal malformations, while they were minor abnormalities in 22 cases (40%). The major abnormalities included 32 cases of anencephaly (Figure 2 and Figure 3) and one case of thanatophoric dysplasia. The minor abnormalities were eight cases of myelomeningocele, five cases of spina bifida, seven abdominal masses (three renal masses, three cases of omphalocele, one case of duodenal atresia) and two cases of hydrocephalus. There were 17 cases of polyhydramnios that were not associated with a foetal malformation and eight cases in which a foetal malformation was discovered without being associated with polyhydramnios (four cardiac abnormalities, one omphalocele, two cases of cleft lip and palate, and one of achondroplasia). The positive predictive value of polyhydramnios for a foetal malformation was 76.4%. The negative predictive value was 99.8%. Sensitivity was 87.3% and specificity was 99.5%. Because there had been no patient consent, no medical termination of pregnancy was practised in the cases of major foetal malformation. There were 16 cases (48.5%) of foetal death in utero, four cases (12.1%) of vaginally delivered anencephalic neonates (Fig. 3) and one case (3%) of a vaginally delivered neonate with thanatophoric dysplasia. The other 12 cases of major foetal malformation (36.4%) were lost to follow-up. All of the minor foetal malformations identified were confirmed post-natally. The neonates were managed in the Paediatric Surgery and Neurosurgery departments.