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.
MRI
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Normal Proximal Pulmonary Artery Diameter on CT and MRI
Normal proximal pulmonary artery diameter on CT and MRI: left 21 ± 3.5 mm, right 18.7 ± 2.8 mm, with key thresholds for pulmonary hypertension.
Normal Pulmonary Artery Trunk Size on CT and MRI
Reference values for normal pulmonary artery trunk diameter on CT and MRI, including sex-specific averages and the upper limit of 28.6 mm.
Q
Normal Quadriceps Angle Size on X-ray, CT & MRI
Normal quadriceps (Q) angle of the knee measures 15–20° on radiography, CT, and MRI, with clinical relevance to patellar instability and tracking disorders.
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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.
Normal Small Bowel Diameter Size on CT, MRI & X-Ray
Normal small bowel anteroposterior diameter is <3 cm in adults, with age-specific pediatric values from 13.9 mm at 6 months to ~24.9 mm at age 15.
Normal Spinal Canal Diameter Size on X-Ray, CT & MRI
Normal spinal canal diameter ranges 17–22 mm in the thoracic spine and 15–25 mm in the lumbosacral spine on radiography, CT, and MRI.
Normal Spinal Canal Size in Stenosis: CT, MRI & X-Ray
Reference thresholds for spinal canal stenosis on CT, MRI, and radiography, covering cervical, thoracic, and lumbosacral measurements for clinical practice.
Normal Spleen Diameter Size by Age: Ultrasound, MRI & CT
Reference guide for normal spleen diameter by age on ultrasound, MRI, and CT—from neonates through young adults, with clinical thresholds.
Normal Suprapatellar Bursa Width on MRI
Normal suprapatellar bursa width on MRI measures less than 5 mm in the lateral dimension, with larger values suggesting joint effusion or bursitis.
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Normal Third Ventricle Transverse Diameter on CT and MRI
Normal third ventricle transverse diameter ranges from 2–10 mm on CT and MRI; values outside this range may indicate hydrocephalus or cerebral atrophy.
Normal Thoracic Lymph Node Size on CT and MRI
Reference guide to normal thoracic lymph node dimensions by location on CT and MRI, including mediastinal, hilar, axillary, and internal mammary stations.
Normal Tibial Torsion Angle Size on CT and MRI
Normal tibial torsion angle ranges from 25–55° on axial CT and MRI, with deviations linked to gait pathology and rotational deformity.
Normal Tibiofemoral Angle Size on Radiography and MRI
Normal tibiofemoral angle measures less than 15° on AP radiography; values above this threshold suggest pathologic varus or valgus deformity.
Normal Trochlear Depth Size on MRI: Knee Reference
Normal femoral trochlear depth on MRI measures greater than 3 mm; values below this threshold indicate trochlear dysplasia and patellar instability risk.
Normal Trochlear Facet Asymmetry Ratio Size on MRI
Normal trochlear facet asymmetry ratio on MRI is less than 0.4; values at or above this threshold suggest femoral trochlear dysplasia.
U
Normal Ureter Average Diameter on CT, Ultrasound & MRI
Normal ureter average diameter is 1.8 mm ± 0.9 mm on imaging; learn measurement technique and clinical thresholds across CT, ultrasound, and MRI.
Normal Uterus Size in Adults: Ultrasound, CT & MRI
Reference normal uterine dimensions by parity and menopausal status on ultrasound, CT, MRI, and hysterosalpingography for accurate clinical interpretation.
V
Normal Van Akkerveeken Distance Size: X-ray, CT, MRI
Normal Van Akkerveeken distance is less than 3 mm on lateral radiography, CT, and MRI, serving as a key marker for lumbosacral instability.
Normal Ventriculomegaly Grading Size on Ultrasound MRI CT
Learn the standard ventriculomegaly grading thresholds—mild, moderate, and severe—measured on coronal imaging by ultrasound, MRI, and CT.
Normal Vermiform Appendix Diameter: Ultrasound, CT & MRI
Normal vermiform appendix diameter is <6 mm on ultrasound and <8 mm on CT; exceeding these thresholds raises concern for acute appendicitis.
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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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