In radiology, a<unk>  is the erosion of the anterior and posterior vertebral endplates in patients with an inflammatory spondyloarthropathy – such as ankylosing spondylitis or an enteropathic arthropathy. The anterior erosion in particular causes a loss of anterior vertebral body concavity, causing the vertebra to display a squared contour or even a barrel-shape. Healing of the erosion results in a sclerotic increase in density causing what is known as a shiny corner sign, which can later result in syndesmophyte formation. It is most easily diagnosed using MRI, compared to conventional radiography. This type of erosion was initially described by Ragnar<unk>  and Sven Ydén in a paper published in 1952.
Romanus lesion
Janeway lesion
Bankart lesion
Lethal midline granuloma
Forchheimer spots
Skip lesion
Rhinolith
Elschnig spots