According to Merck Manuals, when the thecal sac is compressed, the protective membrane surrounding the spinal cord is subjected to increased pressure. According to the Free Dictionary, effacement of the thecal sac means that the thecal sac is becoming shorter or narrower.
According to ChiroGeek, Effacement of the thecal sac and Compression of the thecal sac are common diagnoses on MRI imaging results for individuals with back discomfort. Typically, MRI scans are used to aid in the diagnosis of the causes of lumbar or radicular pain in the lower back.
According to Merck Manuals, the thecal sac could be constricted by bone, blood buildup, abscesses, tumours, or a ruptured or herniated spinal disc. Age-related stiffening of particular connective tissues may also result in thecal sac compression. According to ChiroGeek, hypertrophy of the ligamentum flavum may also have an effect on the thecal sac.
According to The Back Pain Authority, although severe thecal sac compression might impede the circulation of cerebrospinal fluid, most occurrences of impingement on the sac resolve without therapy. Central vertebral disc herniations are most likely to encroach against the thecal sac. Compression of the thecal sac typically creates no obvious symptoms.
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