Extramedullary Cyst-Like Conditions of the Spine
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Extramedullary Cyst-Like Conditions of the Spine

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Questions and Answers

What are the two categories of cyst-like conditions described?

  • Skeletal and muscular cysts
  • Vascular and neural cysts
  • Inflammatory and infectious cysts
  • Meningeal and non-meningeal cysts (correct)

    • Which of the following is an example of a non-meningeal cyst?

  • Perineurial cyst
  • Arachnoid diverticulum
  • Tarlov cyst
  • Ganglion cyst (correct)

    • Where is cerebrospinal fluid located in relation to the spinal cord?

  • Surrounding the spinal cord in the epidural space
  • Between the pia mater and the arachnoid (correct)
  • Within the dura mater
  • Inside the spinal cord

    • Which layer of the meninges directly contacts the spinal cord?

    <p>Pia mater</p> Signup and view all the answers

    What is the function of the epineurium?

    <p>It surrounds the entire nerve trunk</p> Signup and view all the answers

    Which type of cyst is classified as a meningeal cyst-like structure?

    <p>Arachnoid diverticulum</p> Signup and view all the answers

    Which of the following layers is known to contain the nerve fibers?

    <p>Endoneurium</p> Signup and view all the answers

    What anatomical structure is not associated with the meninges?

    <p>Dorsal root ganglion</p> Signup and view all the answers

    What characteristic differentiates discal cysts in dogs from those in people?

    <p>Discal cysts in dogs exhibit acute presentation.</p> Signup and view all the answers

    What is the composition of the wall of discal cysts in people?

    <p>Dense fibrous connective tissue</p> Signup and view all the answers

    What clinical manifestation is typically associated with discal cysts in people?

    <p>Chronic painful lumbar radiculopathy</p> Signup and view all the answers

    How do discal cysts in dogs typically differ in location compared to those in humans?

    <p>They are more common in the cervical region.</p> Signup and view all the answers

    What type of imaging findings are associated with discal cysts?

    <p>An extradural fluid-filled lesion ventral to the cord</p> Signup and view all the answers

    Why is the term 'discal cyst' considered inappropriate for certain cases in dogs?

    <p>They do not resemble human discal cysts in presentation.</p> Signup and view all the answers

    What is a common characteristic associated with the initial presentation of discal cysts in dogs?

    <p>It resembles acute disc herniation.</p> Signup and view all the answers

    What is indicated by the presence of ventral extradural lesions in the vertebral canal?

    <p>Possibility of discal cysts or other conditions</p> Signup and view all the answers

    What characterizes a true cyst?

    <p>An epithelial-lined sac containing liquid or gas</p> Signup and view all the answers

    What are the two types of extramedullary cyst-like lesions mentioned?

    <p>Meningeal and non-meningeal</p> Signup and view all the answers

    Which types of cysts are controversial in their existence in dogs and cats?

    <p>Synovial and ganglion cysts</p> Signup and view all the answers

    How do spinal nerves connect with the dura mater?

    <p>They fuse with the epineurium at the intravertebral foramen</p> Signup and view all the answers

    What is a common cause of spinal cord compression mentioned?

    <p>Intradural arachnoid diverticulum</p> Signup and view all the answers

    What distinctly covers spinal nerves?

    <p>Endoneurium, perineurium, and epineurium</p> Signup and view all the answers

    Which fluid-filled structures are covered in a specific chapter related to spinal cord conditions?

    <p>Meningoceles and dermoid sinuses</p> Signup and view all the answers

    What is a distinguishing feature of the structures often referred to as ‘spinal cysts’?

    <p>They usually do not have an epithelial lining</p> Signup and view all the answers

    What type of tissue primarily composes the wall of the meningeal cyst mentioned?

    <p>Fibrous connective tissue</p> Signup and view all the answers

    Which characteristic is associated with the lining cells of the lesion?

    <p>Small spindle-shaped</p> Signup and view all the answers

    What clinical significance do the cartilaginous foci have within the cyst wall?

    <p>Sign of degeneration</p> Signup and view all the answers

    Which imaging technique is mentioned as useful in identifying arachnoid diverticula in dogs?

    <p>Magnetic resonance imaging</p> Signup and view all the answers

    What age demographic of dogs is primarily discussed in relation to cervical spinal intradural arachnoid cysts?

    <p>Related young pugs</p> Signup and view all the answers

    What is the primary focus of the retrospective analysis cited regarding spinal arachnoid cysts?

    <p>Case studies in dogs</p> Signup and view all the answers

    Which layer is often found overlying the cyst wall as described?

    <p>Connective tissue layer</p> Signup and view all the answers

    What is the primary characteristic of extramedullary cyst-like spinal conditions?

    <p>They are fluid-filled collections outside the spinal cord.</p> Signup and view all the answers

    In which space is cerebrospinal fluid (CSF) located?

    <p>Subarachnoid space</p> Signup and view all the answers

    Which type of cyst is specifically associated with the perineurium?

    <p>Tarlov cysts</p> Signup and view all the answers

    What characteristic distinguishes ligamentous/discal cysts?

    <p>They originate from the spinal ligaments or discs.</p> Signup and view all the answers

    In what way can extramedullary cyst-like conditions affect an individual?

    <p>They can be clinically silent or symptomatic.</p> Signup and view all the answers

    What is the primary function of the subarachnoid space?

    <p>To cushion the spinal cord with cerebrospinal fluid.</p> Signup and view all the answers

    Which of the following types of cysts is categorized under non-meningeal cyst-like conditions?

    <p>Articular process joint cysts</p> Signup and view all the answers

    What type of cyst-like condition is characterized by fluid collections derived from the arachnoid layer?

    <p>Arachnoid diverticulum</p> Signup and view all the answers

    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.

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