Ultrasound at 35-37 weeks can diagnose which fetal abnormalities?

This is an automatically translated article.

Posted by Doctor Nguyen Dinh Hung - Department of Diagnostic Imaging - Vinmec Hai Phong International General Hospital

The rate of malformations detected for the first time at the 3rd trimester ultrasound is 1/200 of pregnancy. Therefore, super-diagnosis of fetal abnormalities at 35-37 weeks is extremely important.

Ultrasound at 35-37 weeks can diagnose the following fetal abnormalities:
1.Nervous system abnormalities Many CNS abnormalities seen at 35-37 weeks have been previously diagnosed. in the first and/or second trimester, although most cases of mild and moderate ventricular dilatation, arachnoid cysts, and all microcephaly were first diagnosed during the third trimester.
2. Facial abnormalities Most facial abnormalities seen at 35-37 weeks had been previously diagnosed in the first and/or second trimester, with the exception of lacrimal cysts that were first diagnosed in the third trimester. The most common facial abnormality was the cleft. cleft lip and palate, all cases were diagnosed in the 1st and/or 2nd trimester; In contrast, no isolated cleft palate was diagnosed prenatally.
3. Cardiac Abnormalities Most cardiac and macrovascular abnormalities seen at 35-37 weeks have been previously diagnosed in the first and/or second trimester. The most common are ventricular septal defects and aortic arch. the right. Among the cases of ventricular septal defect, 18.3% of cases were diagnosed in the third quarter; 4.2% were diagnosed postpartum. Most rhabdomyomas are first diagnosed in the third trimester. Some cases of coarctation of the aorta, aortic/pulmonary stenosis, and tricuspid valve abnormalities are first diagnosed in the third trimester and a few The case was diagnosed only after birth.

4. Chest Abnormalities Most cases of CPAM, diaphragmatic hernia and pleural effusion at 35-37 weeks were diagnosed previously, except for 1 case of diaphragmatic hernia that was first detected in the third trimester.
5. Gastrointestinal abnormalities Common at 35-37 weeks are abdominal cysts, and half of these are diagnosed for the first time in the 3rd trimester. There are 8 cases of esophageal atrophy, of which 4 are suspected. from the 2nd quarter with signs of small gastric sac, 2 cases in the 3rd quarter and 2 cases after birth. One case of duodenal obstruction and small bowel atrophy was diagnosed only late in the second trimester when polyhydramnios was present. All 3 cases of anus without perforation or with rectal-vaginal fistula were diagnosed postpartum only.
6. Abdominal wall abnormalities All of the abdominal wall regurgitation, umbilical hernia, and bladder inversion observed at 35-37 weeks were diagnosed in the 1st and/or 2nd trimester.
7. Urogenital abnormalities Urogenital abnormalities seen at 35-37 weeks were hydronephrosis, unilateral renal aplasia with/without intraperitoneal kidney, bilateral and unilateral polycystic kidney, and most cases were diagnosed previously except except for hydronephrosis. Most urethral prolapse and all ovarian cysts and vaginal stasis are first diagnosed at 35-37 weeks. Prenatal genital examination is optional, and 93% of cases of ambiguity or low urinary tract closure are diagnosed postpartum only.

8. Skeletal abnormalities Most skeletal abnormalities seen at 35-37 weeks were diagnosed in the first and/or second trimester and were most common with clubfoot and polydactyly. Some cases of clubfoot and polytoe and all cases of fusion were diagnosed postpartum. Two cases of cartilage dysplasia were diagnosed for the first time in the third trimester.
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The pregnancy process is monitored by a team of highly qualified doctors Regular check-ups, early detection of abnormalities The package pregnancy helps to facilitate convenient for the birthing process Newborns get comprehensive care

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