<prompt> Spider leg deformity in excretory urogram occurs inHydronephrosisPolycystic kidneyUretroceleRenal agenesis  <response>: polycystic kidney, an autosomal dominant disease, common in females; excretory urogram shows spider leg pattern - elongated and compressed renal pelvis with narrowed and stretched calyces over the cysts. Reference: emedicine.medscape.comaicle983281-workup 