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About 1 in 1500 pregnancies have fetal megacystis discovered during the first trimester ultrasound. Because of obstructive or non-obstructive factors, the fetal bladder may appear enlarged. In the first instance, a lower urinary tract obstruction (LUTO) or obstruction of the bladder outlet causes an increase in hydronephrosis, increased renal parenchymal echogenicity, and oligohydramnios beginning in the second trimester. This condition is associated with poor postnatal renal function and high perinatal mortality. Unusual conditions like the megacystis-microcolon-intestinal hypoperistalsis syndrome are uncommon and are among the non-obstructive causes. Megacystis does not always progress as the pregnancy progresses, and earlier research has even documented spontaneous resolution of the condition while pregnant. Prenatal counseling for fetal megacystis is difficult because of the condition's variable etiology, evolution, and prognosis

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