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Readers ask: What does low lying Conus mean?

Low-lying conus medullaris: It refers to a low position of a normal-appearing conus medullaris with respect to the vertebral level. It is usually located between the T12–L1 and L1–L2 disk level; however, in 6.4% of population it can be found between the upper and middle third of L2.

What does a low conus mean?

MRI is useful for assessing conus position and thickness of the filum terminale and in looking for associated vertebrospinal anomalies. The conus is low-lying when the tip is abnormally located below the lower border of the L2 vertebral body, and the filum is thickened if it appears wider than 1.5 to 2.0 mm on MRI.

What is conus of the spine?

The conus medullaris is the terminal end of the spinal cord, which typically occurs at the L1 vertebral level in the average adult.

What is the medical term conus mean?

74897. Anatomical terminology. The conus medullaris ( Latin for “medullary cone” ) or conus terminalis is the tapered, lower end of the spinal cord. It occurs near lumbar vertebral levels 1 (L1) and 2 (L2), occasionally lower.

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What is the conus?

The conus medullaris is the bundled, tapered end of the spinal cord nerves. Situated near the first two lumbar vertebrae, the conus medullaris ends at the cauda equina, a bundle of spinal nerves and nerve roots. Consequently, problems with the conus medullaris often affect the cauda equina.

What is a low-lying spinal cord?

A low-lying spinal cord (LLC) is defined as the conus medullaris ending below the L2 vertebrae. (1,2) An LLC is usually abnormally fixed to a caudal structure such as a lipoma or scar, which limits caudal-cranial movement. (3) This may be attributed to tethering of the spinal cord.

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 level does the conus medullaris lie?

Gross anatomy The conus medullaris most commonly terminates at the L1/2 intervertebral disc level in children and adults 13. Extending from the conus is a delicate strand of fibrous tissue called the filum terminale that acts to give longitudinal support to the cord.

What are the first signs of cauda equina?

The most common initial symptom of people with cauda equina syndrome caused by a tumor (spinal neoplasm) is severe low back and leg pain. Later findings include lower extremity weakness. Loss of feeling in the legs (sensory loss) and loss of bowel or bladder control (sphincter dysfunction) are also common.

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What causes conus medullaris syndrome?

Conus medullaris syndrome is caused by an injury or insult to the conus medullaris and lumbar nerve roots. It is a clinical subset of spinal cord injury syndromes. Injuries at the level of T12 to L2 vertebrae are most likely to result in conus medullaris syndrome.

What is the difference between cauda equina syndrome and conus medullaris syndrome?

The symptoms and signs of cauda equina syndrome tend to be mostly lower motor neuron (LMN) in nature, while those of conus medullaris syndrome are a combination of LMN and upper motor neuron (UMN) effects (see Table 1, below).

What does conus and Oconus stand for?

CONUS/OCONUS: The continental U.S., or CONUS, is the 48 connected states and District of Columbia. OCONUS is outside the continental U.S.

What is conus at T12?

The conus medullaris, the termination of the spinal cord, is located anywhere between T12 and lower L2. 9. The conus is the last segment of the cord from which nerve roots arise; none arise from the filum.

What is Conus and cauda equina?

The most distal bulbous part of the spinal cord is called the conus medullaris, and its tapering end continues as the filum terminale. Distal to this end of the spinal cord is a collection of nerve roots, which are horsetail-like in appearance and hence called the cauda equina (Latin for horse’s tail).

Is cauda equina syndrome a disability?

If a patient developing cauda equina syndrome does not undergo surgery at the key moment, they can be left with lifelong, disabling symptoms. If this is your experience, you may be able to make a claim for compensation.

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What is the lower end of the spinal cord called?

The bottom of the spine is called the sacrum. It is made up of several vertebral bodies usually fused together as one. The remaining small bones or ossicles below the sacrum are also fused together and called the tailbone or coccyx.

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