Abdominoscrotal hydrocele: a rare cause of a cystic abdominal mass in children.

Abdominoscrotal hydrocele is a rare cause of cystic lower abdominal masses in children. A timely diagnosis is important because early surgical treatment is curative. Graded compression during the ultrasound evaluation might better demonstrate the communication between the abdominal and scrotal components of the fluid collection, thereby avoiding the use of ionizing radiation and/or the sedation required with alternative imaging modalities.