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.
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Normal Acetabular Angle Size in Boys: X-Ray & CT
Normal acetabular angle values in boys from newborn to age 2, measured on anteroposterior radiography, with clinical thresholds for developmental dysplasia.
Normal Acetabular Angle Size in Girls: Radiography & CT
Normal acetabular angle values in girls from newborn to age 2, measured on AP radiography, with clinical thresholds for developmental dysplasia of the hip.
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.
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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 Böhler's Angle Size on Radiography and CT
Normal Böhler's angle measures 25–40° on lateral radiography and CT, serving as a key indicator of calcaneal fracture depression and alignment.
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.
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Normal Caecum Size on Radiography and CT: <9 cm
The normal caecum measures less than 9 cm in anteroposterior diameter on radiography and CT; exceeding this threshold indicates clinically significant distension.
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 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.
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 Colon Diameter Size on Radiography and CT
Normal colonic diameter is less than 6 cm on radiography and CT; values above this threshold indicate significant dilation requiring prompt evaluation.
Normal Colon Wall Thickness on Ultrasound and CT
Normal colon wall thickness measures less than 3–5 mm on CT and ultrasound; values above this threshold suggest pathology requiring further evaluation.
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.
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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.
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