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.
CT
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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 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.
Normal Prevertebral Soft Tissue C2 Thickness Radiography CT
Reference values for normal prevertebral soft tissue maximal thickness at C2 in pediatric patients on lateral radiography and CT by age group.
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.
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 Renal Diameter Size by Age: Ultrasound & CT
Reference guide for normal average renal longitudinal diameter by age from newborn to 4 years on ultrasound and CT imaging.
Normal Renal Pelvis Size on Ultrasound and CT
Reference ranges for normal renal pelvis diameter on ultrasound and CT, with clinical thresholds for hydronephrosis and key measurement pearls.
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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 Small Bowel Wall Thickness on CT and Ultrasound
Normal small bowel wall thickness is less than 3 mm on CT and ultrasound; exceeding this threshold suggests inflammation, ischemia, or neoplasm.
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 Splenic Vein Diameter on Ultrasound and CT
Normal splenic vein diameter measures less than 10 mm on ultrasound and CT, with normal splenic vein length under 13 cm in adults.
Normal Stomach Wall Thickness on Ultrasound and CT
Normal stomach wall thickness measures less than 10 mm on CT and ultrasound; values above this threshold warrant further evaluation for pathology.
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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 Thoracic Wedge Compression Fracture Size on X-Ray/CT
Normal anterior-to-posterior vertebral height difference in thoracic wedge compression fracture is less than 3 mm on lateral radiography and CT.
Normal Thymus Diameter Size on CT by Age Group
Reference CT measurements for normal thymus diameter in children and adolescents, including anteroposterior, transverse, and craniocaudal dimensions by age group.
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 Trachea Coronal/Sagittal Diameter Ratio on X-Ray & CT
The normal trachea coronal-to-sagittal diameter ratio exceeds 0.6 on radiography and CT, helping detect saber-sheath deformity and other tracheal abnormalities.
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Normal Umbilical Vein Diameter on Ultrasound and CT
Normal umbilical vein diameter is less than 3 mm on ultrasound and CT; values at or above this threshold suggest portal hypertension.
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.
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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.
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