2023年7月30日 · Sequestrated disc, also referred to as a free disc fragment, corresponds to extruded disc material that has no continuity with the parent disc and is displaced away from the site of extrusion. By definition, it corresponds to a subtype of disc extrusion .

A sequestered disc herniation occurs when extruded disc material is no longer contiguous with the parent nucleus pulposus. The free disc fragment typically lateralizes and may migrate superiorly or inferiorly.

The lumbar spine is the most commonly affected region, but the cervical and thoracic spine can also be affected. Here, we report four cases of disc sequestration mimicking a spinal tumor and review the literature to provide insight into discriminating between a herniated disc …

TABLE 1:Comparison ofSurface-Coil MRImaging andCT Myelography inIdentifying Sequestered Disks MA:150,May1988 MROFSEQUESTERED DISKS i159 Fig.5.-A,Ti-weightedsaglttalimageshows largeanterior extradural defectatU/SI level, which hassoft-tluue signal (arrows). ftIsIm- possible todistinguish anularfibers fromher- niatednuclear material …

2022年3月7日 · A free fragment, also known as a sequestered disc, is one type of herniated disc in which a piece breaks off from the main structure. Once separated, the detached fragment can, and often does, move up or down, causing symptoms or repercussions at an entirely different level of the spine.

MRI of the lumbar spine is common. Disc pathology on this large volume is common. Disc sequestration is not that common at all and almost always means surgery rather than conservative management. This case is used in 12 unlisted playlists.

Based on a retrospective review of MR images of 3,000 patients with a histological diagnosis of herniated disc, Carvi y Nievas, et al. identified a 0.4% (11 patients) incidence of unusual sequestered disc fragments that were mistaken for other space-occupying lesions.

2020年7月15日 · Disc sequestration corresponds to extruded disc material that has no continuity with the parent disc and is displaced away from the site of extrusion. It is also called free disc fragment or migrated disc.

On MRI, sequestered discs occurring within the central canal tend to adhere closely to the posterior cortex of the vertebral body. They may have a lentiform or round shape. When they take a lentiform shape (Fig 4), haematoma or epidural infection should be considered in the differential diagnosis. When the sequestered disc has a rounded shape

MRI has proven to be an invaluable modality for diagnosing and understanding disc sequestration. Its capacity to produce high-resolution images that reflect the pathophysiology of the disc and delineate the surrounding neural fibers allows precise evaluation (1, 2).