“…The differential diagnosis of cystic pelvic masses in the male fetus and neonate includes ureterocele, congenital vesical diverticulum, rectal duplication, anterior myelomeningocele, teratoma, a dysplastic kidney in an ectopic position (often associated with congenital seminal vesicle cyst), but the most difficult differential diagnosis is cyst of the urogenital sinus or Müllerian remnants [14]. Several imaging techniques have been recommended in evaluating and differentiating pelvic cystic masses, especially ultrasonography [3][4][5][6][7][8][9][10][11][12][13][14][15], CT and MRI [16,17], which currently seem the ideal methods for differentiating cystic malformation of the pelvis in a young boy. They accurately show the anatomical relationships with the surrounding structures and help to plan surgical excision.…”