Showing posts with label ankylosing spondylitis. Show all posts
Showing posts with label ankylosing spondylitis. Show all posts
Saturday, March 13, 2010
Friday, March 5, 2010
ANKYLOSING SPONDYLITIS-MRI
There is a spectrum of destructive lesions involving the discovertebral junction in ankylosing spondylitis known as Anderson’s lesion. It may be of 2 types -
1. An "inflammatory" type characterized by a defect in one or two neighbouring vertebral bodies surrounded by reactive sclerosis and associated with varying degrees of disc space narrowing.
2. A "non-inflammatory" type showing predominantly osteolytic destruction with little disc space narrowing and sclerosis.
The MRI characteristics of the disc also help to distinguish the Anderson lesion from infection spondylitis. In most cases the major part of the disc shows decreased signal intensity on T2 weighted images (due to fibrous replacement of the disc), while generalized increased signal intensity due to inflammatory oedema and granulation tissue would be expected in established acute infective spondylitis
Erosions on the antero-lateral margins of the vertebrae with sclerosis associated with enthesitis are known as Romanus sign or Shiny corner sign.
Focal areas of increased signal intensity in disc correspond to active inflammatory granulation tissue.
Bone marrow fat deposits can be seen as hyperintense areas in vertebrae on both T1 and T2 sagittal images.
In severe cases, ankylosis followed by kyphosis noted.
Paravertebral soft tissue masses are uncommon as seen in infective diskitis.
1. An "inflammatory" type characterized by a defect in one or two neighbouring vertebral bodies surrounded by reactive sclerosis and associated with varying degrees of disc space narrowing.
2. A "non-inflammatory" type showing predominantly osteolytic destruction with little disc space narrowing and sclerosis.
The MRI characteristics of the disc also help to distinguish the Anderson lesion from infection spondylitis. In most cases the major part of the disc shows decreased signal intensity on T2 weighted images (due to fibrous replacement of the disc), while generalized increased signal intensity due to inflammatory oedema and granulation tissue would be expected in established acute infective spondylitis
Erosions on the antero-lateral margins of the vertebrae with sclerosis associated with enthesitis are known as Romanus sign or Shiny corner sign.
Focal areas of increased signal intensity in disc correspond to active inflammatory granulation tissue.
Bone marrow fat deposits can be seen as hyperintense areas in vertebrae on both T1 and T2 sagittal images.
In severe cases, ankylosis followed by kyphosis noted.
Paravertebral soft tissue masses are uncommon as seen in infective diskitis.
Tuesday, February 9, 2010
Andersson lesion-Ankylosing Spondylitis
In ankylosing spondylitis Discovertebral lesions are frequently termed Andersson lesions. Many reports have emphasised on destructive abnormalities at discovertebral junction in this disorder. These lesions have been observed in the early and late phases of the disease and occur in traumatic and nontraumatic situations. This is a case of ankylosing spondylitis with history of trauma. This can mimic tuberculosis especially in our country
Second opinion- Teleradiology Providers
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