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.
CT
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D
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 Esophageal Wall Thickness on CT: Key Reference
Normal esophageal wall thickness on CT is less than 5 mm; values exceeding this threshold warrant further evaluation for pathology.
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 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.
Normal Femoral Neck Anteversion by Age: X-ray, CT, MRI
Normal femoral neck anteversion decreases from 30–50° at birth to ~18° in adults; learn measurement thresholds across radiography, CT, and MRI.
Normal Femoral Neck Torsion Angle Size on CT
Normal femoral neck torsion angle on CT ranges from 34–40° in newborns, with values declining through childhood into adulthood.
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.
Normal Fourth Ventricle Size on Ultrasound MRI CT: Neonates
Normal fourth ventricle sagittal diameter measures 4 mm in newborns on ultrasound, MRI, and CT—key reference for neonatal neuroimaging.
H
Normal Haller Index: CT Measurement for Pectus Excavatum
Normal Haller Index on CT is less than 2.5; values ≥3.25 typically indicate surgical correction for pectus excavatum.
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.
Normal Hydronephrosis Grading: CT, MRI & Ultrasound
Learn the standard 0–4 hydronephrosis grading system on CT, MRI, and ultrasound, including key imaging findings and clinical thresholds for each grade.
I
Normal Inferior Vena Cava Diameter on Ultrasound and CT
The normal average inferior vena cava diameter is 20 mm on ultrasound and CT, a key threshold for filter sizing and hemodynamic assessment.
Normal Internal Auditory Canal Size on CT and MRI
Normal internal auditory canal diameter measures 4–8 mm on axial CT and MRI; values below 2 mm indicate stenosis with clinical significance.
Normal Intrahepatic Duct Size on Ultrasound, CT & MRI
Normal intrahepatic bile ducts measure less than 2 mm in diameter; values exceeding this threshold suggest biliary dilatation requiring clinical correlation.
K
Normal Kidney Cortex Thickness on Ultrasound and CT
Normal renal cortex thickness ranges from 2.6–10.6 mm on CT and ultrasound; learn measurement technique, clinical thresholds, and key pathologies.
Normal Kidney Diameter Size on Ultrasound, CT & MRI
Normal kidney diameter ranges 9–13.5 cm depending on side; learn measurement thresholds across ultrasound, CT, and MRI for clinical practice.
Normal Kidney Parenchyma Thickness on Ultrasound & CT
Normal renal parenchymal thickness ranges 9.8–21.2 mm on CT and ultrasound; learn measurement technique and clinical thresholds for abnormal findings.
Normal Kidney Size Discrepancy: Ultrasound & CT Reference
Normal maximal diameter discrepancy between left and right kidneys is ≤1.5 cm on ultrasound and CT, per large MDCT reference data.
Normal Klaus Index Size on X-ray, CT & MRI
The normal Klaus Index measures >30 mm on lateral cervical imaging, helping clinicians detect basilar invagination on X-ray, CT, and MRI.
L
Normal Lateral Recess Height Size on CT and MRI
Normal lateral recess height measures greater than 2 mm on CT and MRI; values at or below this threshold indicate stenosis requiring clinical correlation.
Normal Liver Diameter Size by Age: Ultrasound, CT & MRI
Reference guide for normal liver diameter measured in the midclavicular line across all age groups on ultrasound, CT, and MRI imaging.
Normal Lumbosacral Angle Size on X-ray, CT & MRI
The normal lumbosacral angle measures 26–57° on lateral imaging; deviations correlate with low back pain, spondylolisthesis, and altered spinal biomechanics.
Normal Lumbosacral Disc Angle Size on X-ray, CT & MRI
The normal lumbosacral disc angle measures 10–15° on lateral imaging; deviations may indicate spondylolisthesis, disc pathology, or postural malalignment.
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.
O
Normal Ovarian Vein Diameter on Ultrasound and CT
Normal ovarian vein diameter measures less than 7 mm on ultrasound and CT; values at or above this threshold may indicate pelvic venous insufficiency.
Normal Ovary Volume Size on Ultrasound, CT & MRI
Normal ovarian volume ranges from <20 mL premenopausal to <10 mL postmenopausal; learn thresholds for PCOS and fertility assessment on ultrasound, CT, and MRI.
P
Normal Papilla of Vater Diameter on Ultrasound and CT
Normal papilla of Vater diameter is less than 10 mm on CT and ultrasound; enlargement beyond this threshold warrants further clinical investigation.
Normal Patellar Tilt Angle: Radiography, CT & MRI
Normal patellar tilt angle is 20° on sunrise view; learn measurement technique and clinical significance on radiography, CT, and MRI.
Normal Pelvic Lymph Node Size on CT and MRI
Normal inguinal pelvic lymph nodes measure less than 1.5 cm on CT and MRI; exceeding this threshold warrants further clinical evaluation.
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