Association Between Incomplete Partition Type III and Abnormal Hypothalamic Morphology: Further Imaging Evidence

Area of Science:

• Genetics
• Neurology
• Radiology

Background:

• Incomplete partition III (IP-III) is a rare X-linked genetic disorder causing congenital hearing loss.
• Inner ear imaging is key for IP-III diagnosis.
• Recent studies suggest a link between IP-III and hypothalamic malformations.

Purpose of the Study:

• To investigate and characterize hypothalamic morphologic abnormalities in patients with IP-III.
• To add to the understanding of the association between IP-III and brain malformations.

Main Methods:

• Retrospective analysis of MRI scans from 8 subjects diagnosed with IP-III.
• Subjects included one set of brothers.
• Focus on evaluating hypothalamic structures on MRI.

Main Results:

• Seven out of eight subjects (87.5%) exhibited hypothalamic abnormalities.
• Abnormalities included asymmetrical thickening, symmetrical thickening, and mass-like enlargement.
• Asymmetrical caudal extension was noted in 6 of 7 subjects with abnormalities, best seen on coronal oblique T2-weighted images.
• No subjects presented with clinical endocrinologic or neurologic symptoms.

Conclusions:

• The study provides further MRI evidence supporting the association between IP-III and hypothalamic morphologic abnormalities.
• Hypothalamic abnormalities are common in IP-III patients, even without overt clinical symptoms.
• This highlights the importance of considering hypothalamic evaluation in IP-III diagnosis.