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What are the two categories of cyst-like conditions described?
What are the two categories of cyst-like conditions described?
Which of the following is an example of a non-meningeal cyst?
Which of the following is an example of a non-meningeal cyst?
Where is cerebrospinal fluid located in relation to the spinal cord?
Where is cerebrospinal fluid located in relation to the spinal cord?
Which layer of the meninges directly contacts the spinal cord?
Which layer of the meninges directly contacts the spinal cord?
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What is the function of the epineurium?
What is the function of the epineurium?
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Which type of cyst is classified as a meningeal cyst-like structure?
Which type of cyst is classified as a meningeal cyst-like structure?
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Which of the following layers is known to contain the nerve fibers?
Which of the following layers is known to contain the nerve fibers?
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What anatomical structure is not associated with the meninges?
What anatomical structure is not associated with the meninges?
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What characteristic differentiates discal cysts in dogs from those in people?
What characteristic differentiates discal cysts in dogs from those in people?
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What is the composition of the wall of discal cysts in people?
What is the composition of the wall of discal cysts in people?
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What clinical manifestation is typically associated with discal cysts in people?
What clinical manifestation is typically associated with discal cysts in people?
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How do discal cysts in dogs typically differ in location compared to those in humans?
How do discal cysts in dogs typically differ in location compared to those in humans?
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What type of imaging findings are associated with discal cysts?
What type of imaging findings are associated with discal cysts?
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Why is the term 'discal cyst' considered inappropriate for certain cases in dogs?
Why is the term 'discal cyst' considered inappropriate for certain cases in dogs?
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What is a common characteristic associated with the initial presentation of discal cysts in dogs?
What is a common characteristic associated with the initial presentation of discal cysts in dogs?
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What is indicated by the presence of ventral extradural lesions in the vertebral canal?
What is indicated by the presence of ventral extradural lesions in the vertebral canal?
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What characterizes a true cyst?
What characterizes a true cyst?
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What are the two types of extramedullary cyst-like lesions mentioned?
What are the two types of extramedullary cyst-like lesions mentioned?
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Which types of cysts are controversial in their existence in dogs and cats?
Which types of cysts are controversial in their existence in dogs and cats?
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How do spinal nerves connect with the dura mater?
How do spinal nerves connect with the dura mater?
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What is a common cause of spinal cord compression mentioned?
What is a common cause of spinal cord compression mentioned?
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What distinctly covers spinal nerves?
What distinctly covers spinal nerves?
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Which fluid-filled structures are covered in a specific chapter related to spinal cord conditions?
Which fluid-filled structures are covered in a specific chapter related to spinal cord conditions?
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What is a distinguishing feature of the structures often referred to as ‘spinal cysts’?
What is a distinguishing feature of the structures often referred to as ‘spinal cysts’?
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What type of tissue primarily composes the wall of the meningeal cyst mentioned?
What type of tissue primarily composes the wall of the meningeal cyst mentioned?
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Which characteristic is associated with the lining cells of the lesion?
Which characteristic is associated with the lining cells of the lesion?
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What clinical significance do the cartilaginous foci have within the cyst wall?
What clinical significance do the cartilaginous foci have within the cyst wall?
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Which imaging technique is mentioned as useful in identifying arachnoid diverticula in dogs?
Which imaging technique is mentioned as useful in identifying arachnoid diverticula in dogs?
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What age demographic of dogs is primarily discussed in relation to cervical spinal intradural arachnoid cysts?
What age demographic of dogs is primarily discussed in relation to cervical spinal intradural arachnoid cysts?
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What is the primary focus of the retrospective analysis cited regarding spinal arachnoid cysts?
What is the primary focus of the retrospective analysis cited regarding spinal arachnoid cysts?
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Which layer is often found overlying the cyst wall as described?
Which layer is often found overlying the cyst wall as described?
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What is the primary characteristic of extramedullary cyst-like spinal conditions?
What is the primary characteristic of extramedullary cyst-like spinal conditions?
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In which space is cerebrospinal fluid (CSF) located?
In which space is cerebrospinal fluid (CSF) located?
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Which type of cyst is specifically associated with the perineurium?
Which type of cyst is specifically associated with the perineurium?
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What characteristic distinguishes ligamentous/discal cysts?
What characteristic distinguishes ligamentous/discal cysts?
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In what way can extramedullary cyst-like conditions affect an individual?
In what way can extramedullary cyst-like conditions affect an individual?
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What is the primary function of the subarachnoid space?
What is the primary function of the subarachnoid space?
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Which of the following types of cysts is categorized under non-meningeal cyst-like conditions?
Which of the following types of cysts is categorized under non-meningeal cyst-like conditions?
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What type of cyst-like condition is characterized by fluid collections derived from the arachnoid layer?
What type of cyst-like condition is characterized by fluid collections derived from the arachnoid layer?
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Study Notes
Extramedullary Cyst-Like Conditions of the Spine
- Extramedullary spinal conditions are fluid-filled collections found outside the spinal cord.
- Can be clinically silent or cause compression of the spinal cord or nerve roots.
- These conditions may be referred to as "spinal cysts" but most don't meet the definition of a true cyst.
- They can be categorized into meningeal and non-meningeal lesions.
Meningeal Cyst-Like Conditions
- The meninges are the layers of tissue that surround the brain and spinal cord.
- The space between the pia mater and arachnoid is called the subarachnoid space, containing cerebrospinal fluid.
- Dorsal and ventral nerve roots travel through the subarachnoid space covered by pia mater before piercing the dura mater, taking a sleeve of arachnoid with them.
Intradural Arachnoid Diverticulum
- A rare cause of spinal cord compression in dogs, very uncommon in cats.
- These structures communicate freely with the anatomic subarachnoid space.
- They do not correspond to the more chronic, degenerative entity seen in people.
Extradural Spinal Perineurial (Tarlov) Cysts
- Located within the dural sheath of the spinal nerves.
- Develop within the perineurium, the sheath surrounding nerve fascicles.
Non-Meningeal Cyst-Like Conditions
- More commonly originate from articular process joints.
Articular Process Joint Cysts
- Can be synovial or ganglion cysts.
- Synovial cysts are filled with synovial fluid and communicate with the joint cavity.
- Ganglion cysts are thought to develop due to trauma to the joint and have a more gelatinous fluid.
Ligamentous/Discal Cysts
- Controversial in dogs and cats.
- Discal cysts are ventral intraspinal fluid-filled structures with a wall of dense fibrous connective tissue, communicating with the intervertebral disc.
- They appear as ventral extradural lesions in the vertebral canal immediately adjacent to the intervertebral disc.
- In people, they manifest as chronic painful lumbar radiculopathy.
- In dogs, they have a more acute presentation, are more common in the cervical region, and are typically non-painful.
- The term 'discal cyst' might be inappropriate because these lesions differ in clinical presentation and MRI findings when comparing dogs and people.
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Description
Explore the intricacies of extramedullary spinal conditions, including their classification and impact on the spinal cord. This quiz covers both meningeal and non-meningeal cyst-like lesions and focuses on their clinical significance. Test your knowledge on unique cases such as intradural arachnoid diverticulum in animals.
