PMC7217677_01
The fracture line (arrow) from the caudal side of the pars interarticularis to the superior intervertebral foramen.
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No obvious fracture line was seen on plain radiography, but a right non-isthmic spondylolysis was noted at L5 on computed tomography (Fig. 1).
A model showing the atypical fracture line in the coronal plane along the dorsal side of the right transverse process from the caudal side of the pars interarticularis to the superior intervertebral foramen seen in this case.
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Bone modeling provided further clarification: the fracture lines were seen in the coronal direction along the dorsal side of the right transverse process from the caudal side of the pars interarticularis to the superior intervertebral foramen (Fig. 2).
High signal intensity (circle) in the superior articular process and the pedicle around the fracture line.
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STIR magnetic resonance imaging showed an area of high signal intensity in the superior articular process and the pedicle around the fracture line (Fig. 3).
Illustration showing the six previously reported atypical fracture lines depicted by black lines. Red line indicates the new fracture line type reported in this case.
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Six types of atypical imaging presentations have been previously reported as non-isthmic spondylolysis (Fig. 4),).