Normal Bull's Angle Size on X-ray, CT & MRI
Normal Bull's angle of the cervical spine measures less than 13° on lateral radiography, CT, and MRI, serving as a key indicator of atlantoaxial instability.
Cervical Spine
21 entries
B
C
Normal Cervical Interspinous Distance Size on Radiography, CT, MRI
Normal cervical interspinous distance should be less than 1.5× the mean interspinous distance — a key radiologic marker for ligamentous injury.
Normal Cervical Posterior Line Alignment on X-ray, CT, MRI
Normal cervical posterior line displacement is less than 2 mm on lateral radiography, CT, and MRI — a key marker for detecting instability.
Normal Cervical Wedge Compression Fracture Size on X-Ray & CT
Normal cervical wedge compression fracture threshold: posterior-to-anterior vertebral height difference less than 3 mm on lateral radiography and CT.
Normal Chamberlain's Line Measurement: X-Ray, CT & MRI
Normal Chamberlain's line measures less than 3 mm odontoid tip projection on lateral radiography, CT, and MRI for craniovertebral junction assessment.
D
Normal Digastric Line Cervical Measurements on X-ray, CT, MRI
Learn normal digastric line thresholds for atlanto-occipital and odontoid distances on radiography, CT, and MRI in cervical spine assessment.
Normal Dublin's Distance Size: Radiography, CT & MRI
Normal Dublin's Distance ranges 2–5 mm (mandible–atlas) and 9–12 mm (mandible–axis) on lateral cervical imaging across radiography, CT, and MRI.
F
Normal Fischgold's Bimastoid Line Size on X-ray, CT, MRI
Normal Fischgold's bimastoid line measurement: the odontoid tip should lie less than 10 mm above this craniometric line on X-ray, CT, or MRI.
H
Normal Harris Line Measurements: Cervical Radiography, CT, MRI
Normal Harris line measurements include basion-odontoid and basion-posterior axial line distances of less than 12 mm on lateral cervical imaging.
M
Normal McGregor's Line Measurement: Radiography, CT, MRI
Normal McGregor's line measures less than 4.5 mm above the line, used to assess basilar invagination on lateral cervical imaging.
P
Normal Powers Index Cervical Size: X-Ray, CT & MRI
The normal Powers Index is less than 1 on lateral imaging; values ≥1 indicate atlantooccipital dislocation on X-ray, CT, or MRI.
Normal Prevertebral Soft Tissue C2 Thickness Radiography CT
Reference values for normal prevertebral soft tissue maximal thickness at C2 in pediatric patients on lateral radiography and CT by age group.
Normal Prevertebral Soft Tissue Thickness on Radiography
Normal prevertebral soft tissue thickness values on lateral cervical radiography, from C1 to C7, based on Penning 1981 reference data.
Normal Prevertebral Soft Tissue Thickness on Radiography
Normal prevertebral soft tissue thickness in cervical spine flexion on lateral radiography, with average values from C1 to C7 per Penning 1981.
Normal Prevertebral Soft Tissue Thickness on Radiography
Normal prevertebral soft tissue thickness on lateral cervical radiography ranges from 3.2 mm at C2 to 15.1 mm at C6 in neutral position.
Normal Prevertebral Soft Tissue Thickness on X-Ray, CT & MRI
Reference values for normal prevertebral soft tissue thickness at C1–C7 on radiography, CT, and MRI, with clinical significance and measurement technique.
Normal Pseudosubluxation Size on Cervical Radiography
Normal pseudosubluxation at C2/C3 measures less than 3 mm on lateral cervical radiography, a critical threshold to distinguish physiologic from true subluxation.
Normal Pseudosubluxation Size on Cervical Spine Radiography
Normal cervical pseudosubluxation measures less than 3 mm at C3/C4 on lateral radiography, a key threshold for distinguishing physiologic from pathologic displacement.
R
Normal Retrotracheal Space Diameter at C5 on Radiography
Normal retrotracheal space maximal diameter at C5 on lateral neck radiography ranges from 1.2–2.0 cm in pediatric patients aged 0–14 years.
S
Normal Schmidt-Fischer Angle Size on X-ray, CT & MRI
Normal Schmidt-Fischer angle measures 124–127° at the odontoid, a key craniovertebral junction landmark assessed on radiography, CT, and MRI.
W
Normal Wackenheim's Angle Size on X-ray, CT & MRI
Normal Wackenheim's angle measures >150° on lateral imaging; learn its clinical significance for craniocervical junction stability assessment.
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