Double line sign | Radiology Reference Article - Radiopaedia.org
2023年2月28日 · The double line sign is a pathognomonic MRI finding seen at the periphery of a region of osteonecrosis or bone infarct, representing the border between the viable and non-viable bone 4. It is best seen on T2 and T2 FS sequences and consists of two serpentine lines: an inner bright line representing reparative granulation tissue and an outer ...
Osteonecrosis of the femoral head - Radiopaedia.org
2024年7月2日 · T2: may show a second hyperintense inner line between normal marrow and ischemic marrow; this appearance is highly specific for osteonecrosis of the hip and is known as the "double-line sign" Staging. Several staging systems for osteonecrosis of the hip exist.
AVN of the Hip | Radsource
(7a) A Coronal T2-weighted fat suppressed image demonstrates a small focus of avascular necrosis with the double-line sign. The linear high signal intensity inner line (arrow) and dark peripheral line (arrowhead) is typical.
Avascular necrosis of the hip - double line sign
Selected T2 coronal image shows a geographic area of altered signal with the double line sign. the inner hyperintense line (yellow) represents granulation tissue. outer hypointense line (blue) represents combination of reactive bone sclerosis and fibrosis.
Role of Imaging in Osteonecrosis (Avascular Necrosis) of Hip
MR imaging is more sensitive than conventional radiography, CT, or radionuclide bone scintigraphy in detection of AVN of the hip. In differentiating AVN from non-AVN disease of the femoral head, MR imaging has a specificity of 98% and a sensitivity of 97%.
The double-line sign of osteonecrosis: evaluation on chemical …
The MR appearance of osteonecrosis was assessed on selective fat and water images to further evaluate the features of the double-line sign of osteonecrosis.
Avascular osteonecrosis of the hip: The vision of the radiologist ...
2021年6月1日 · On T2 weighting-imaging, a hyperintense line between the normal and ischemic marrow is sometimes visible; this sign is pathognomonic of bone necrosis and is known as the “double line sign”. This article reviews imaging features of standard radiographs, computed tomography and MRI and addresses the role of imaging in this pathology.
AVN Hip: Radiology - SpringerLink
2023年7月20日 · Avascular necrosis (AVN) or osteonecrosis of the femoral head is a term broadly applied to ischaemic marrow lesions resulting from a wide range of conditions ranging from systemic causes and post-traumatic sequelae to a significant proportion of idiopathic cases.
Avascular Necrosis of the Femoral Head | SpringerLink
2023年9月23日 · The double-line sign on MR consists of a peripheral low T2 signal line with an inner rim of high T2 signal reflecting granulation tissue. In advanced stages, subchondral fracture and articular surface collapse can be best demonstrated on x-ray.
Osteonecrosis | UW Radiology - University of Washington
This border may sometimes appear as a dark line adjacent to a bright line — the so-called “double line sign”. Occasionally osteonecrosis will present as an area of diffuse low signal intensity, which may be difficult to differentiate from other entities, such as osteomyelitis, stress fracture, etc.
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