Normal Prostate Dimensions on Ultrasound
Normal prostate dimensions on ultrasound measure approximately 2.8 × 2.8 × 4.8 cm, with values above this threshold suggesting benign or malignant enlargement.
Ultrasound
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Normal Prostate Volume Size on Ultrasound
Normal prostate volume on ultrasound is up to 30 mL in adults; values above this threshold may indicate benign or malignant enlargement.
Normal Pylorus Diameter & Thickness on Ultrasound
Normal pyloric muscle thickness is <3 mm and channel length <15 mm on ultrasound; values above these thresholds suggest hypertrophic pyloric stenosis.
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Normal Renal Artery Velocity Size on Ultrasound
Normal peak systolic renal artery velocity on Doppler ultrasound is less than 200 cm/s, a key threshold for detecting renal artery stenosis.
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.
Normal Renal Resistive Index Size on Ultrasound
Learn the normal renal resistive index on Doppler ultrasound, its clinical thresholds, and how values above 0.7 suggest obstruction or intrinsic disease.
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Normal Scrotal Wall Thickness on Ultrasound
Normal scrotal wall maximal thickness on ultrasound measures 2–8 mm, with thickening indicating edema, infection, or inflammatory pathology.
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 Spermatic Cord Vein Size on Ultrasound
Normal spermatic cord vein diameter is ≤2.2 mm on ultrasound; values above this threshold indicate varicocele graded mild, moderate, or severe.
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 Testicular Appendix Diameter on Ultrasound
Normal testicular appendix diameter measures less than 5 mm on scrotal ultrasound; enlargement beyond this threshold suggests torsion or inflammation.
Normal Testicular Resistance Index Size on Ultrasound
Normal testicular arterial resistance index (RI) on Doppler ultrasound ranges from 0.48 to 0.75, aiding diagnosis of torsion and ischemia.
Normal Testicular Volume Size by Age on Ultrasound
Reference values for normal testicular volume and length on ultrasound from newborn through adolescence, with clinical significance and measurement technique.
Normal Testicular Volume Size on Ultrasound
Normal testicular volume on ultrasound measures less than 15–20 mL in adult males; learn measurement technique and clinical significance.
Normal Testis Size on Ultrasound: Key Dimensions
Learn normal testicular dimensions on ultrasound—4–5 × 2–3 × 2–2.5 cm—and the clinical significance of deviations from these reference values.
Normal Third Ventricle Size on Ultrasound: Newborn
Normal third ventricle width on neonatal cranial ultrasound measures up to 4 mm in coronal projection, with values above this threshold raising concern for hydrocephalus.
Normal Thorax/Abdomen Circumference Ratio on Ultrasound
Normal fetal thorax circumference to abdomen circumference ratio is >0.77 on ultrasound, a key marker for detecting thoracic dysplasia.
Normal Thyroid Diameter Size on Ultrasound
Reference values for normal thyroid diameter on ultrasound in newborns, children, and adolescents, with clinical significance and measurement technique.
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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.
Normal Uterus Size in Children and Adolescents: Ultrasound
Reference normal uterine length and width on ultrasound in pediatric patients aged 1–20 years, with clinical guidance for radiologists.
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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 Wirsung Canal Diameter on Ultrasound
The normal Wirsung canal (main pancreatic duct) measures less than 2 mm in anteroposterior diameter on ultrasound in children.
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