What is terminal cyst?
A filar cyst is an incidental finding on neonatal lumbar sonography located in the filum terminale of the spinal cord. It is considered a normal variant and is often confused for a ventriculus terminalis, a smooth dilated cavity of the central canal, located within the conus medullaris.
Where does the filum terminale attach?
coccyx
The lower part, or filum terminale externum, closely adheres to the dura mater. It extends downward from the apex of the tubular sheath and is attached to the back of the first segment of the coccyx in a structure sometimes referred to as the coccygeal ligament.
Is filum terminale covered by Dura?
Gross anatomy The filum terminale is continuous with the pia mater and is described as having two sections: filum terminale internum: upper three quarters of the filum; covered by the spinal dura and arachnoid meninges.
What is the 5th ventricle?
Ventriculus terminalis (VT), also known as the “fifth ventricle”, is an ependymal lined CSF-filled cavity within the conus medullaris. It is formed during embryogenesis via canalization and retrogressive differentiation of caudal spinal cord and regresses completely during early childhood.
What is terminal lipoma?
Fatty filum terminale, also known as lipoma of the filum terminale or filar lipoma, is a relatively common finding on imaging of the lumbar spine, and in most cases is an incidental finding of no clinical concern. However, in some patients it may be associated with signs and symptoms of tethered cord syndrome.
What is posterior root ganglion?
A dorsal root ganglion (or spinal ganglion; also known as a posterior root ganglion) is a cluster of neurons (a ganglion) in a dorsal root of a spinal nerve. The cell bodies of sensory neurons known as first-order neurons are located in the dorsal root ganglia.
At what vertebrae does the spinal cord end?
The spinal cord ends at the intervertebral disc between the first and second lumbar vertebrae as a tapered structure called the conus medullaris, consisting of sacral spinal cord segments.
What is a thecal sac?
Thecal sac is the outer covering of the spinal cord. This means there are bone spurs on the back of the spinal bones, putting pressure on or affecting the front part of the outer layer of the (neck) cervical spinal cord.
What is sectioning of the filum terminale?
A section of the filum terminale (SFT) is used for the surgical treatment of isolated tethered cord or that resulting from neurulation disorders. More recently, it has been proposed for the management of the occult tethered cord syndrome (OTCS), though it is still under debate.
What is incidental fatty filum terminale?
Fatty filum terminale, also known as lipoma of the filum terminale or filar lipoma, is a relatively common finding on imaging of the lumbar spine, and in most cases is an incidental finding of no clinical concern. In such cases, it is usually associated with a thickened filum and a low-lying conus .
What is a filar cyst?
A filar cyst is an incidental finding on neonatal lumbar sonography located in the filum terminale of the spinal cord. It is considered a normal variant and is often confused for a ventriculus terminalis, a smooth dilated cavity of the central canal, located within the conus medullaris.
What is the filum terminale an extension of?
Filum terminale: an extension of the pia mater that extends from the terminal end of the spinal cord to the tailbone. The filum terminale helps to anchor the spinal cord in place.
