Summary of Pathologic Findings in Lymph Nodes (LNs) From Different Areas LNs Total Gross Microscopic Hilar and suprahilar LNs 697 190 507 Aortic (preaortic
, para- 740 469 271 aortic, and retroaortic) Interaortocaval 639 435 204 Caval (precaval, paracaval, 352 216 136 and retrocaval) Retroperitoneal 143 105 38 External iliac 42 24 18 Common iliac 182 128 54 Total Total Positive LNs Positive, Positive, Gross LNs, No.
Preaortic connections between the right and left components of the azygos venous system are referred to as pre-aortic interazygos veins and are described as an unusual and rare form of variation of the venous system (Nishie et al., 2009).
The preaortic interazygos vein was a direct continuation of the hemiazygos vein which drained the 9th to 11th left posterior intercostal veins.
It does however; appear that connections between the hemiazygos and azygos veins lying anterior to the aorta, "preaortic connections" are a rare finding.
Preaortic interazygos veins can be joined by other posterior intercostal veins as in the reports by Das & Paul (2004) and Pyrzowski et al., or accompanied by additional retroaortic anastomoses as in the report by Ozdemir et al.
Reports of the preaortic interazygos veins possibly resembling serious pathologies are well documented in the literature (Gilkeson et al.).
2), interarterial or preaortic
course, anterior or prepulmonic course and septal or subpulmonic course.
He was referred for a contrast enhanced CT scan of the abdomen that revealed multiple enlarged, lymph nodes in the mesentery, preaortic
, Para aortic and precaval regions.
Normally, the retro aortic components atrophy and the preaortic anastomosis persist and develop into left renal vein which passes in front of the aorta and renal arteries to open into the IVC.
The persistence of 'renal collar' gives rise to double left renal veins, preaortic and post aortic both draining into the IVC(6).