IVP in ureterocele usually shows a round filling defect, sometimes large, in the bladder corresponding to the ureterocele, and characteristic finding of duplication of the collecting system (ureteroceles are nearly always associated with ureteral duplication) Ureterocele :Is a cystic dilatation of the terminal ureter, and is obstructive because of a pinpoint ureteral orifice. It is more common in females Affected children often are discovered by prenatal sonography or during an investigation of UTI (IVP) Treatment : o transurethral incision of ureterocele : effectively relieves the obstruction but it may result in V.U.R. necessitating ureteral reimplantation later, or ' open excision of ureterocele and reimplantation 'as primary management'. About other options An isolated VUR or Duplication of ureter do not explain the filing defect in the bladder. Sacrococcygeal Teratoma : The most common presentation here is with an abnormal, obvious protruding mass from the sacral area. Out of the 4 varieties known, only Type IV which contributes 9.8 % ie entirely pre-sacral and not visible externally (90.8% tumors are visible externally). Bladder and Rectum may be displaced anteriorly but a filling defect is not characteristic as in ureterocele. Ureters may be partially obstructed resulting in hydro-ureter and hydronephrosis.