title: Retroperitoneal cystic lymphangioma in a boy aged 12 years.
mesh_terms: D002648:Child; D006801:Humans; D007223:Infant; D008202:Lymphangioma; D018191:Lymphangioma, Cystic; D008297:Male; D009369:Neoplasms; D012186:Retroperitoneal Neoplasms; D012187:Retroperitoneal Space
keywords: LYMPHANGIOMA/in infancy and childhood; RETROPERITONEAL SPACE/neoplasms