ABSTRACT
An Intradiscal gas collection, referred to as the vacuum disc phenomenon (VDP) is a relatively common finding on radiographic studies of the lumbar spine, whereas gas-containing lumbar disc hernia is rarely observed. We report a case of a patient with left leg pain, provoked by a radiographically and surgically documented L4-5 gas containing disc hernia.
Subject(s)
Cysts/complications , Decompression, Surgical , Lumbar Vertebrae , Radiculopathy/etiology , Spinal Diseases/complications , Cysts/surgery , Humans , Male , Middle Aged , Radiculopathy/pathology , Radiculopathy/surgery , Spinal Diseases/surgeryABSTRACT
Steady flows and pulsatile flows of a Newtonian fluid through a channel with a rectangular hump were numerically studied as a two-dimensional model of blood flow in a constricted artery. From the numerical calculation, it was shown that one of the hydrodynamic causes of endothelial lesion of artery and post-stenotic dilatation can be found in the large temporal variation of shear stress behind a constricted portion of artery. Local maximum of the pressure there can be seen as secondary factor for the post-stenotic dilatation.
