Normal Anterior Pituitary Size on CT and MRI
Normal anterior pituitary anteroposterior diameter varies by age and physiologic state, ranging from <6 mm in children to <12 mm in pregnancy on MRI and CT.
Neuroradiology
9 entries
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Normal Cerebellar Tonsil Position Size on CT and MRI
Normal cerebellar tonsils sit less than 3 mm below the foramen magnum on MRI and CT — a key threshold for diagnosing Chiari malformation.
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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.
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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.
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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.
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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 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.
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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.
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