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.
MRI
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F
Normal Filum Terminale Size on Ultrasound and MRI
Normal filum terminale diameter is less than 2 mm on ultrasound and MRI; values at or above this threshold suggest a thickened filum and possible tethered cord.
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 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 Hip Alpha Angle Size on MRI: Reference Guide
The normal hip alpha angle on MRI is less than 55°; values at or above this threshold indicate cam-type femoroacetabular impingement.
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 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 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 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.
Normal Knee Joint Space Width on Radiography and MRI
Normal knee joint space width measures 3–5 mm on anteroposterior radiography, a key threshold for detecting cartilage loss and osteoarthritis.
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 Lateral Trochlear Inclination Size on MRI
Normal lateral trochlear inclination on MRI measures greater than 11°, a key threshold for assessing patellar instability and trochlear dysplasia.
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.
Normal Metaphyseal-Diaphyseal Tibia Angle Size on Radiography
Normal metaphyseal-diaphyseal tibia angle is less than 11° on AP radiography, helping distinguish physiological bowing from pathological tibia vara.
O
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 Patellar Nose Size on Radiography and MRI
Learn the normal patellar nose measurements on radiography and MRI, including key thresholds linked to patellar instability and chondral pathology.
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.
Normal Perirectal Lymph Node Size on CT and MRI
Normal perirectal lymph nodes measure less than 5–8 mm on CT and MRI; exceeding this threshold raises concern for malignant involvement.
Normal Pituitary Gland Diameter Size on MRI
Normal pituitary gland anteroposterior diameter on MRI is up to 6 mm in children under 12 and up to 10 mm at puberty.
Normal Pituitary Stalk Size on CT and MRI
Normal pituitary stalk diameter measures less than 2–5 mm on CT and MRI; values above this range suggest pathological thickening.
Normal Popliteal Artery Diameter on Ultrasound, CT & MRI
Normal popliteal artery diameter ranges from 4.1–5.6 mm on axial imaging; learn measurement technique and clinical thresholds across ultrasound, CT, and MRI.
Normal Posterior Cruciate Ligament Thickness on MRI
Normal posterior cruciate ligament thickness on MRI measures less than 6 mm; values above this threshold suggest PCL pathology requiring further evaluation.
Normal Posterior Semicircular Canal Size on CT and MRI
Normal posterior semicircular canal average diameter is 1.5 mm on axial CT and MRI, a key reference for evaluating inner ear anomalies.
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.
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