title: [Fine-needle aspiration biopsy under sonographic guidance in renal and retroperitoneal masses].
mesh_terms: D000328:Adult; D001707:Biopsy, Needle / Q000379:methods*; D006801:Humans; D007668:Kidney / Q000473:pathology*; D007680:Kidney Neoplasms / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000473:pathology*; D014463:Ultrasonography