An Interesting Neonatal Abdominal Mass

ABSTRACT

We present the case of a neonate who was born with an antenatal ultrasound diagnosis of a cystic abdominal mass of uncertain origin. The diagnosis of pelviureteric junction obstruction (PUJO) was obscured by difficulty determining the origin of the extremely large cystic abdominal mass. Sonographically; the kidneys appeared relatively normal; creating a diagnostic dilemma - the hydronephrosis was almost exclusively in an extrarenal pelvis. Additionally; contralateral hydronephrosis secondary to the mass effect further confused the diagnosis. We discuss the differential diagnosis of neonatal cystic abdominal masses and review the literature of giant hydronephrosis