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From Embryology
| Abnormality name | Affected region | phase of occurrence | Definition |
|---|---|---|---|
| Esophageal atresia | Foregut ( Esophagus | occurs in 8th week | 1 in 3000-4500 birth- results from deviation of trachoesophageal septum and there is incomplete separation of the eosphagus from laryngotracheal tube. |
| Eosphageal stenosis | Foregut ( Esophagus | during week 8 | Due to incomplete recanalisation of Esophagus |
| Congenital hypertrophic pyloric stenosis | Foregut ( stomach) | onset at 3rd week and can present neonatally | 1 in 150 male and 1-750 female- muscular thickening of the pylorus |
| Reverse rotation | Midgut | Midgut loop rotates in clockwise direction. Doudenum lies anterior to the superior messentric artery ( normally it should lie posteriorly) and transverse colon lies posterior instead of anterior to it ( artery).
| |
| Anal agenesis | Hidngut | week 7 | Anal canal end blindly or ectopic anus, or anoperineal fistula. Anal canal may open into vagina in female or urethra in male. |
