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Making MR Imaging Child's Play - Pediatric Neuroimaging Protocol, Guidelines and Procedure
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Interhypothalamic adhesions: prevalence, structure, and location-based classification map in pediatric patients

Michael P Oien1, Onur Tuncer2, David Nascene3

  • 1Mayo Clinic Department of Radiology, Mayo Building West, 2nd Floor 200 First St. SW, Rochester, MN, 55905, USA.

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|November 14, 2024
PubMed
Summary

Interhypothalamic adhesions (IHAs) occur in 2.13% of pediatric patients and often persist over time. These adhesions show gray matter signal intensity, with Type 3 IHAs linked to pituitary abnormalities.

Keywords:
Gray matterInterhypothalamic adhesionPediatric neuroimagingPrevalence

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Area of Science:

  • Pediatric Neuroradiology
  • Neuroimaging
  • Endocrinology

Background:

  • Interhypothalamic adhesions (IHAs) are rare findings predominantly reported in pediatric populations.
  • Their prevalence, persistence, and precise histological composition remain largely uncharacterized.
  • Understanding IHAs is crucial for diagnosing associated neurological and endocrine conditions.

Purpose of the Study:

  • To determine the prevalence of IHAs in pediatric brain MRI studies.
  • To assess the persistence of IHAs through longitudinal imaging.
  • To classify IHAs by anatomical distribution, explore their imaging characteristics, and identify associated pathologies.

Main Methods:

  • Retrospective review of pediatric brain MRI scans (2012-2013).
  • Confirmation of IHAs on at least two imaging planes.
  • Measurement of IHA cross-sectional area and signal intensity (T2WIs), normalized against white and gray matter signals.
  • Collection of patient demographics and clinical information.

Main Results:

  • A prevalence of 2.13% (33/1550 patients) for IHAs was identified.
  • IHAs demonstrated persistence in 92% of follow-up scans.
  • Normalized IHA signal intensity strongly correlated with gray matter (r=0.83, P<0.001) but not white matter (r=-0.16, P=0.494).
  • Commonly associated pathologies included hydrocephalus (9), prematurity (8), and corpus callosum abnormalities (7).
  • All Type 3 IHAs (3/3) were associated with pituitary pathologies.

Conclusions:

  • IHAs are present in 2.13% of the pediatric cohort and are largely persistent.
  • IHA signal intensity on MRI mirrors that of gray matter.
  • Type 3 IHAs are exclusively associated with pituitary abnormalities, highlighting their clinical significance.