Trefoil-shaped central canal stenosis leading to lateral stenosis is most characteristic of which type of stenosis?

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Multiple Choice

Trefoil-shaped central canal stenosis leading to lateral stenosis is most characteristic of which type of stenosis?

A trefoil-shaped central canal on axial images signals a fixed, developmental narrowing of the canal. In congenital stenosis, the spinal canal is intrinsically small from birth, and the cross-section often takes a three-lobed (trefoil) appearance because the canal is constricted in multiple directions. This pattern commonly involves the lateral recesses, leading to lateral stenosis as a natural extension of the already narrow canal. Degenerative stenosis usually shows irregular, more diffuse narrowing from osteophyte formation and ligamentum flavum hypertrophy rather than a characteristic trefoil shape; traumatic stenosis tends to present with fracture or dislocation changes. So the trefoil configuration is most characteristic of congenital stenosis.

A trefoil-shaped central canal on axial images signals a fixed, developmental narrowing of the canal. In congenital stenosis, the spinal canal is intrinsically small from birth, and the cross-section often takes a three-lobed (trefoil) appearance because the canal is constricted in multiple directions. This pattern commonly involves the lateral recesses, leading to lateral stenosis as a natural extension of the already narrow canal. Degenerative stenosis usually shows irregular, more diffuse narrowing from osteophyte formation and ligamentum flavum hypertrophy rather than a characteristic trefoil shape; traumatic stenosis tends to present with fracture or dislocation changes. So the trefoil configuration is most characteristic of congenital stenosis.

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