title: Azygos vein abutting the posterior wall of the right main and upper lobe bronchi: a normal CT variant.
abstract: In 9% of 78 normal computed tomographic examinations, the azygos vein was interposed between the posterior wall of the right-main or right-upper-lobe bronchi and lung in the azygoesophageal recess. Observation of the azygos vein on contiguous scans will generally allow a confident identification of this normal variant. Contrast enhancement will elucidate difficult cases.
mesh_terms: D000328:Adult; D000368:Aged; D001401:Azygos Vein / Q000000981:diagnostic imaging*; D001995:Bronchography; D006801:Humans; D008875:Middle Aged; D014057:Tomography, X-Ray Computed