<prompt> Oligohydramnios is associated with :Neural tube defectsRenal agenesisPostmature bihPremature bih  <response>: Etiology of oligohydramnios: Intrauterine growth restriction Post-term pregnancy Premature rupture of membranes Drugs like ACE inhibitors and prostaglandin inhibitors Renal anomalies Renal Agenesis Infantile polycystic kidney disease urinary tract obstruction refer pgno:216 Sheila 2nd edition 