title: Retroperitoneal abscess presenting as an abdominal mass in neonate.
abstract: This is the first reported case of a retroperitoneal abscess in a neonate. The patient presented with a large abdominal mass at 3 wk of age. Excretory urogram followed by surgery established the diagnosis. Retroperitoneal abscesses must be considered in the differential diagnosis of abdominal masses in the new born.
mesh_terms: D000008:Abdominal Neoplasms / Q000175:diagnosis*; D000038:Abscess / Q000175:diagnosis* / Q000601:surgery; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000175:diagnosis* / Q000601:surgery; D012187:Retroperitoneal Space; D014567:Urography