New imaging features of tuberous sclerosis complex: A 7 T MRI study

Area of Science:

• Neuroimaging
• Neurology
• Medical Physics

Background:

• Tuberous Sclerosis Complex (TSC) is a genetic disorder with diverse neurological manifestations.
• In vivo studies on the perivenous association of tubers and iron deposition in TSC are limited.
• Susceptibility Weighted Imaging (SWI) offers high sensitivity for detecting subtle changes.

Purpose of the Study:

• To investigate the relationship between cortical tubers and veins in TSC patients.
• To quantify iron deposition in deep gray nuclei of TSC patients using SWI.
• To explore potential venous involvement in TSC pathogenesis and iron accumulation.

Main Methods:

• 11 TSC patients and 15 healthy controls underwent 7 Tesla (7T) SWI.
• Cortical tubers and their association with veins were evaluated on SWI.
• Local Field Shift (LFS) maps were generated to quantify iron deposition in deep gray nuclei.
• Covariance analysis compared LFS between TSC patients and controls.

Main Results:

• 91.3% of cortical tubers showed venous involvement on SWI.
• Tubers were often oriented along penetrating veins, suggesting migration along vasculature.
• Significantly higher LFS (indicating more iron) was found in the thalamus of TSC patients compared to controls (p < 0.01).

Conclusions:

• SWI at 7T reveals a strong perivenous association of cortical tubers in TSC.
• Increased iron deposition in the thalamus of TSC patients is demonstrated in vivo.
• These findings provide novel insights into TSC pathophysiology and lesion development.