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Brain changes in Kallmann syndrome.

R Manara¹, A Salvalaggio², A Favaro³

¹From the Department of Neuroradiology (R.M., F.D.S.), University of Salerno, Salerno, Italy Istituto di Ricovero e Cura a Carattere Scientifico S. Camillo (R.M., V.C.), Venezia, Italy ENT section (R.M., A.S.), Department of Neurosciences, "Federico II" University, Napoli, Italy. rmanara@unisa.it.

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Summary

This summary is machine-generated.

Kallmann syndrome patients show distinct brain structure changes, particularly in areas near the olfactory sulci, despite normal overall gray and white matter volumes. These findings suggest olfactory bulb abnormalities impact basal forebrain development.

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Area of Science:

Neuroimaging
Endocrinology
Genetics

Background:

Kallmann syndrome is a rare genetic disorder characterized by hypogonadotropic hypogonadism and the absence of the sense of smell.
It results from defective neuronal migration during development, affecting olfactory and gonadotropin-releasing hormone (GnRH) neurons.
Associated brain abnormalities have been reported, necessitating detailed investigation.

Purpose of the Study:

To investigate brain structural changes in male patients with Kallmann syndrome using advanced MR imaging techniques.
To compare quantitative MR imaging metrics between patients and healthy controls.

Main Methods:

Brain MR imaging (3D-T1, FLAIR, diffusion tensor imaging) was performed on 45 male patients with Kallmann syndrome and 23 age-matched controls.
Analyses included voxel-based morphometry, sulcation, curvature, cortical thickness, and tract-based spatial statistics.

Main Results:

While overall gray and white matter volumes and diffusion metrics did not differ significantly, specific regional changes were observed.
Patients exhibited gray matter volume changes and white matter volume reduction near olfactory sulci.
Reduced olfactory sulcal depth, altered curvature, and increased cortical thickness in the olfactory sulcus region were noted.

Conclusions:

This study reveals significant, localized morphologic and structural brain alterations in male Kallmann syndrome patients.
These changes are likely associated with olfactory bulb hypoplasia/aplasia and selectively affect the basal forebrain cortex.