Abstract: Congenital high airway obstruction syndrome (CHAOS) is the obstruction of the fetal upper airways, which may be partial or complete. It is usually incompatible with life. Prenatal recognition of the disease is quite important due to the recently described management options. Bilateral renal agenesis is also an uncommon prenatal diagnosis. It is a lethal anomaly with 50% of the fetuses being stillborn; therest would die shortly after birth. It is also associated with many other congenital anomalies many of which have autosomaldominant or recessive inheritance. Absence of kidneys in renal fossae with pulmonary hypoplasia and oligohydramnios or anhydramnios strongly suggests the diagnosis of bilateral renal agenesis..
Key words: hyperechoic lungs, oligohydramnios, congenital anomalies, fetus, Sonography
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