Normal Gallbladder Wall Thickness on Ultrasound
Normal gallbladder wall thickness on ultrasound is under 3 mm in adults and varies by age in pediatric patients, aiding detection of cholecystitis and other pathology.
Ultrasound
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Normal Gestational Sac Diameter Size on Ultrasound
Normal gestational sac diameter on ultrasound follows the Age − 30 mm rule in the first trimester, with key thresholds guiding early pregnancy assessment.
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Normal Hip Alpha Angle Size on Ultrasound
Learn the normal hip alpha angle threshold on ultrasound, its clinical significance in developmental dysplasia of the hip, and measurement technique pearls.
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.
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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 Carotid Artery Stenosis Grading on Ultrasound
Learn the Society of Radiologists in Ultrasound consensus criteria for grading internal carotid artery stenosis by Doppler ultrasound, including PSV, EDV, and ICA/CCA ratios.
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.
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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.
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Normal Lateral Ventricle Size on Ultrasound
Normal lateral ventricle measurements on cranial ultrasound, including body and frontal horn dimensions, with clinical thresholds for ventriculomegaly.
Normal Left Gastric Vein Diameter: Ultrasound Reference
Normal left gastric vein diameter is less than 6 mm on color Doppler ultrasound; enlargement is a key marker of portal hypertension and variceal risk.
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 Liver Segments Anatomy on Ultrasound
A concise ultrasound reference for normal liver segment anatomy based on the Couinaud classification, essential for lesion localization and surgical planning.
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Normal Maximum Vertical Pocket Size on Ultrasound
Learn the normal and abnormal Maximum Vertical Pocket thresholds on obstetric ultrasound, including the >8 cm cutoff for polyhydramnios diagnosis.
Normal Maximum Vertical Pocket Size on Ultrasound >24 Weeks
Learn the normal maximum vertical pocket threshold for diagnosing oligohydramnios after 24 weeks on obstetric ultrasound, with clinical and technical guidance.
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Normal Neonatal Adrenal Gland Size on Ultrasound
Reference values for normal neonatal adrenal gland size on ultrasound, including maximal diameter, length, and thickness in newborns.
Normal Nuchal Thickness Size 18–22 Weeks Ultrasound
Normal fetal nuchal fold thickness measures less than 6 mm on ultrasound between 18–22 weeks; values at or above this threshold raise concern for aneuploidy.
Normal Nuchal Translucency Size on Ultrasound 11–14 Weeks
Normal nuchal translucency measures less than 3 mm on ultrasound between 11–14 weeks, with values above this threshold raising concern for chromosomal abnormalities.
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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 in Children: Ultrasound Reference
Reference guide for normal pediatric ovarian volume by age group on ultrasound, from neonates through adolescence, with clinical thresholds.
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.
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Normal Pancreas Diameter Size on Ultrasound
Reference guide to normal pancreas anteroposterior diameter on ultrasound across all age groups, from neonates to adults.
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 Placenta Previa Distance Size on Ultrasound
Learn the normal placenta-to-os distance threshold for placenta previa on ultrasound, with clinical significance and measurement technique pearls.
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 Popliteal Artery Peak Systolic Velocity on Ultrasound
Normal popliteal artery peak systolic velocity on duplex ultrasound ranges from 55–82 cm/s, a key benchmark for diagnosing peripheral arterial disease.
Normal Portal Vein Diameter on Ultrasound
Reference values for normal portal vein diameter on ultrasound across all age groups, from neonates to adults, with clinical significance.
Normal Portal Vein Velocity on Ultrasound
Normal portal vein velocity on Doppler ultrasound ranges from 20–30 cm/s, a key metric for detecting portal hypertension and hepatic vascular disease.
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