This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urogenital System, Subject name: Radiology
Spider leg appearance in Intra venous urography is seen in- 
Select and explain. 
A. Congenital Polycystic Kidney Disease, B. Hydronephrosis, C. Renal stone, D. Renal cell carcinoma
A: Congenital Polycystic Kidney Disease
Answer: A: Congenital Polycystic Kidney Disease 
Explanation: Ans. is 'a' i.e., Congenital polycystic kidney diseaseRadiological appearanceo Paint - brush appearanceo Soap - bubble nephrogramo "Swiss - cheese" nephrogramo Dense persistent nephrogramo Striated nephrogramMedullary sponge kidneyHydronephrosisAdult polycystic kidney diseaseAcute ureteric obstruction, hypotensionInfantile polycystic kidneyRenal traumaAcute pyelonephritiso Sun - burst nephrogramo Crescentic deformity of calyces (wind glass sign)o "Egg in cup" appearanceo Drooping flower appearanceo Smudged papillao Infundibular stricture with focal hydrocalcicosiso Phantom / amputed calyxo Putty or cement kidneyo "Saw-toothed" or "Cork-screw" appearance of uretero "Flower-vase" curves of uretero "Spoked - wheel" appearanceo Bilateral spider leg deformityo Thimble bladdero Fish hook bladdero Sandy patcheso "Fetal - head" calcification of bladdero "Tear-drop" bladderPolycystic kidneyPolycystic kidneyPapillary necrosisEctopic ureter (Duplication anamoly)Earliest sign of renal TBRenal TBRenal TBRenal TBTB ureteritisHorse - shoe kidneyOncocytomaPolycystic kidney diseaseTubercular cystitisBPHSchistosomiasis of bladderSchistosomiasis 1 BilharziasisPelvic lipomatosisBilateral pelvic hematomaBilateral pelvic lymphadenopathyPelvic abscessIntraperitoneal bladder ruptureo Sun-burst' appearance of bladdero "Fir-tree" / "Pine-tree" / Christmas-tree" bladdero Droping flower appearance ("Drooping Lilly" sign)o Rim signExtraperitoneal bladder ruptureNeurogenic bladderEctopic ureter (Duplication anamoly)Acute complete renal artery occlusionHydronephrosis (Chronic obstruction)Acute tubular necrosisRenal vein thrombosiso Crescent signHydronephrosis