Annular thecal sac indentation occurs when the outer ring of an intervertebral disc (the annulus fibrosus) bulges or protrudes into the spinal canal, pressing ...
Dr. Lisa S. Apfel MD - Spine and Neurosurgery
Extradural thecal sac indentation, also known as thecal sac effacement or compression, is a radiological finding seen on MRI or CT scans when structures ...
Intradural thecal sac indentation refers to an imaging finding—most often seen on MRI—where pressure from within or outside the dural sac causes it to deform ...
Traumatic thecal sac indentation refers to the inward deformation or compression of the thecal sac—the dural sheath that encloses the spinal cord and ...
Degenerative Thecal Sac Indentation is an MRI finding where age-related wear and tear in the spine—such as disc bulges, bone spurs (osteophytes), or ligament ...
Diffuse thecal sac indentation is an imaging finding seen on MRI or CT scans of the spine. The “thecal sac” is a membrane filled with cerebrospinal fluid (CSF) ...
Non-contained thecal sac indentation refers to a condition in which disc material that has broken through (extruded) the annulus fibrosus—without being held in ...
Contained thecal sac indentation, also known as contained dural sac effacement, refers to a focal compression or “flattening” of the thecal sac—the membranous ...
Paramedian thecal sac indentation refers to an impression or flattening of the dural (thecal) sac just off the midline (paramedian) within the spinal canal, ...
Posterolateral thecal sac indentation is a form of spinal canal narrowing in which structures at the back‐and‐side (posterolateral) region of the spine press ...
Lateral side thecal sac indentation refers to a focal inward pressing or flattening along the side portion of the thecal sac—the membrane-lined tube of dura ...
The lateral recess (also called the subarticular zone) is a three-sided channel in the lumbar spinal canal through which each nerve root travels before exiting ...
