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ABSTRACT We report the case of a fetus with mega-bladder and suspected lower urinary tract obstruction (LUTO). The 20-week pregnancy ultrasound scan showed absence of amniotic fluid (anhydramnios), enlarged bladder, and narrowing of the urethra in the proximal region. At 21 weeks of gestational age, vesicocentesis was performed for relief of obstruction and analysis of biochemical of the fetal urine and karyotyping was carried out, which presented normal result (46,XY). This technique is indicated in cases of severe oligohydramnios or difficulty of placental access and has diagnostic and therapeutic function.