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Manual Segmentation of the Human Choroid Plexus Using Brain MRI
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Choroid plexus: normal size criteria on neuroimaging.

Megha Madhukar1, Arabinda K Choudhary, Danielle K Boal

  • 1Department of Radiology, Penn State Milton S. Hershey Medical Center, H066, 500 University Drive, P.O. Box 850, Hershey, PA, 17033, USA. mmadhukar@hmc.psu.edu

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Summary

This study establishes normal choroid plexus size in children using MRI and ultrasound, providing a simple clinical tool for diagnosing pathologies. Average thickness was 3.2 mm in lateral ventricles and 2.5 mm in the fourth ventricle.

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Area of Science:

  • Pediatric Radiology
  • Neuroimaging
  • Choroid Plexus Anatomy

Background:

  • Normal size criteria for the choroid plexus are not well-established.
  • This ambiguity hinders the recognition of small or diffuse choroid plexus pathologies.
  • Accurate size assessment is crucial for pediatric neurological assessments.

Purpose of the Study:

  • To determine the normal size of the choroid plexus in the pediatric population.
  • To establish reference values using magnetic resonance imaging (MRI) and ultrasound (US).
  • To propose a simple, reproducible, and quick clinical measurement tool.

Main Methods:

  • Retrospective evaluation of choroid plexus size in 90 children (0-16 years).
  • Analysis of 97 imaging studies (71 MRI, 26 US) without choroid plexus pathology.
  • Calculation of average and range of choroid plexus thickness across age groups and gender.

Main Results:

  • Mean choroid plexus thickness: 3.2 mm in lateral ventricles, 2.5 mm in the fourth ventricle.
  • Specific measurements: 3.4 mm (axial), 3.3 mm (coronal), 3.1 mm (sagittal) in lateral ventricles.
  • Lateral limb of the fourth ventricle choroid plexus measured 11.3 mm in length.
  • No significant trends observed with age or gender.

Conclusions:

  • Established average choroid plexus thickness in pediatric lateral ventricles (3.2 mm) and fourth ventricle (2.5 mm).
  • Findings provide essential reference data for diagnosing pediatric choroid plexus conditions.
  • The study supports a simplified approach to choroid plexus size measurement.