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Thecal sac indentation occurs when external factors, such as a herniated disc or spinal stenosis, exert pressure on the sac, causing it to become compressed. This finding can be seen on MRI when being evaluated for back pain or other spinal conditions.
A herniated disc impinging on the thecal sac is an extremely common terminology used on MRI reports and other forms of diagnostic radiology evaluations. The condition may also be noted as a bulging disc encroaching on the thecal sac or a herniated disc indenting the thecal sac.
Thecal sac indentation is a medical condition that occurs when the spinal canal narrows or experiences pressure, causing compression on the thecal sac—a protective membrane surrounding the spinal cord and cerebrospinal fluid. This condition can lead to various symptoms, ranging from mild discomfort to severe neurological issues.
The thecal sac, also known as the dural sac, is a membrane sheath that covers the spinal cord and the surrounding cerebral spinal fluids (CSF). Indentation means there is some compression of the thecal sac itself, but it does not appear to affect the nerves.
What Is Thecal Sac? Thecal sac is the layer that protects the spinal cord. It is filled with cerebrospinal Fluid and has numerous nerve roots. Thecal sac is enclosed in the Dura Matter. Dura matter is the outer layer which covers the central nervous system, which includes the brain and spinal cord 1. Thecal sac varies in both genders.
It shows there may be a minimal indentation of the thecal sac at cervical 5 and 6 vertebrae, and mild indentation at few other cervical levels due to a disc prolapse, which might cause a headache, a neck pain or a tingling sensation of the upper limbs.
In spinal stenosis, the thecal sac is compressed by the protruding disc anteriorly and ligamentum flavum posteriorly, forming an hourglass shape. “Cloverleaf” or “trefoil” shape of the spinal canal for indentation of posterolateral thecal sac and severe central canal stenosis.
Mri report states circumferential disc bulge cv4-5 level and cv5-6 causing indentation of thecal sac and narrowing right existing nerve root. advise?
The thecal sac or dural sac is the membranous sheath (theca) or tube of dura mater that surrounds the spinal cord and the cauda equina. The thecal sac contains the cerebrospinal fluid which provides nutrients and buoyancy to the spinal cord. [1]
A clear explanation of Thecal sac indentation with easy to understand illustrations and narration.