title: Pelvic mass in a 12-year-old girl.
mesh_terms: D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008588:Meningocele / Q000000981:diagnostic imaging*; D009192:Myelography; D010386:Pelvic Neoplasms / Q000000981:diagnostic imaging*; D011187:Posture; D012447:Sacrum