Normal Abdominal Lymph Node Size on CT and MRI
Reference guide for normal abdominal lymph node size thresholds by location on CT and MRI, including porta hepatis, paraaortic, and mesenteric stations.
MRI
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A
Normal Achilles Tendon Width Size on Radiography, Ultrasound, CT & MRI
Normal Achilles tendon width measures 4–9 mm on lateral imaging; values outside this range suggest tendinopathy, partial tear, or rupture.
Normal Adrenal Gland Arm Thickness Size on CT and MRI
Normal adrenal gland arm thickness measures less than 3 mm on CT and MRI; values above this threshold raise concern for adrenal pathology.
Normal Anterior Pituitary Size on CT and MRI
Normal anterior pituitary anteroposterior diameter varies by age and physiologic state, ranging from <6 mm in children to <12 mm in pregnancy on MRI and CT.
Normal Aortic Diameter Size on Ultrasound, CT & MRI
Reference guide to normal aortic diameter measurements by segment on ultrasound, CT, and MRI, based on EAE clinical practice recommendations.
Normal Appendix Wall Thickness on Ultrasound, CT & MRI
Normal vermiform appendix wall thickness measures less than 3 mm on ultrasound, CT, and MRI — a key threshold for excluding appendicitis.
Normal Atlanto-Temporomandibular Index Size on Radiography, CT, MRI
The atlanto-temporomandibular index normal value exceeds 22 mm on lateral imaging, serving as a key marker for craniocervical instability assessment.
B
Normal Bladder Wall Thickness on Ultrasound, MRI & CT
Normal bladder wall thickness is <3 mm when distended and <5 mm when non-distended on ultrasound, MRI, and CT imaging.
Normal Boogaard's Angle Size on X-ray, CT & MRI
Normal Boogaard's angle measures less than 135° on lateral imaging; values at or above this threshold suggest basilar invagination or platybasia.
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.
C
Normal Cerebellar Tonsil Position Size on CT and MRI
Normal cerebellar tonsils sit less than 3 mm below the foramen magnum on MRI and CT — a key threshold for diagnosing Chiari malformation.
Normal Cervical Basal Angle Size on X-ray, CT & MRI
Normal cervical basal angle ranges from 125–143° on lateral imaging; values outside this range may indicate platybasia or craniovertebral junction anomalies.
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 Lymph Node Size on CT, MRI & Ultrasound
Reference thresholds for pathological cervical lymph node enlargement by level on CT, MRI, and ultrasound in head and neck imaging.
Normal Cervical Lymph Node Size on Ultrasound, CT & MRI
Learn the pathological enlargement thresholds for cervical lymph nodes by level on ultrasound, CT, and MRI, based on evidence-based radiology criteria.
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 CFL/ATFL Angle Size on MRI: Reference Values
The normal CFL/ATFL angle on MRI ranges from 70° to 140°, a key measurement for assessing lateral ankle ligament anatomy and injury.
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.
Normal Cochlear Bud Size on CT and MRI: Key Reference
Normal cochlear bud diameter measures 1–3 mm on axial CT and MRI, a critical landmark when evaluating congenital sensorineural hearing loss in children.
Normal Common Bile Duct Size on CT, MRI & Ultrasound
Normal common bile duct diameter is <6 mm without cholecystectomy and <10 mm post-cholecystectomy on CT, MRI, and ultrasound.
Normal Common Cavity Inner Ear Size on CT
Normal CT dimensions of the common cavity inner ear malformation: average vertical diameter 4 mm and horizontal diameter 10 mm in axial plane.
Normal Common Hepatic Duct Size on Ultrasound, CT & MRI
The normal common hepatic duct measures less than 5 mm in diameter on ultrasound, CT, and MRI in adults without biliary pathology.
Normal Common Iliac Artery Diameter: Ultrasound, CT & MRI
Normal common iliac artery diameter ranges 7.9–12.1 mm on axial imaging; learn measurement technique and clinical thresholds across ultrasound, CT, and MRI.
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.
Normal Duct of Wirsung Diameter: Ultrasound, CT & MRI
Normal Duct of Wirsung diameter is <3 mm at the pancreatic head and <2 mm in the body/tail on ultrasound, CT, MRI, and cholangiography.
E
Normal Endometrium Thickness on Ultrasound and MRI
Reference guide to normal endometrial thickness by menopausal status on ultrasound and MRI, with clinical thresholds for workup.
F
Normal Fallopian Tube Size on Ultrasound, CT & MRI
Normal fallopian tube length is <14 cm and diameter <4 mm; learn measurement techniques across ultrasound, CT, MRI, and hysterosalpingography.
Normal Femoral Angle Size on Radiography and MRI
Normal femoral angle at the knee measures 75–85° on AP radiography; learn measurement technique, clinical significance, and common pathologies.
Normal Femoral Artery Diameter on Ultrasound, CT & MRI
Reference values for normal femoral artery diameter on ultrasound, CT, and MRI: common femoral 6.6–9.6 mm, superficial femoral 4.3–7.2 mm.
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