Pre- and postcontrast MR studies in tuberous sclerosis

Area of Science:

• Neuroimaging
• Neurology
• Radiology

Background:

• Tuberous sclerosis is a genetic disorder causing tumors in various organs, including the brain.
• Intracranial manifestations, such as subependymal and peripheral lesions, are common.
• Understanding the MR characteristics of these lesions is crucial for diagnosis and management.

Purpose of the Study:

• To report and emphasize previously understressed MR findings in intracranial tuberous sclerosis.
• To analyze signal intensity patterns and contrast enhancement of subependymal and peripheral lesions.
• To correlate MR findings with potential pathological processes.

Main Methods:

• Retrospective review of MR imaging in eight patients with intracranial tuberous sclerosis.
• Analysis of lesion location (subependymal, peripheral, supratentorial).
• Evaluation of signal intensities on proton density, T1, and T2-weighted images, with and without contrast administration.

Main Results:

• All eight patients had supratentorial peripheral lesions (cortical/subcortical); seven had subependymal lesions.
• The majority of subependymal lesions enhanced with contrast, challenging the notion that enhancement solely indicates actively growing giant cell astrocytomas.
• Peripheral lesions were hyperintense on PD/T2-weighted images, with half showing elevated T1 signal intensity, possibly indicating early calcification; none enhanced with contrast.

Conclusions:

• Contrast enhancement in subependymal lesions may not always signify actively growing tumors.
• Elevated T1 signal in peripheral lesions is a notable finding that warrants further investigation for early calcification.
• Distinct MR characteristics of subependymal and peripheral lesions aid in the comprehensive evaluation of tuberous sclerosis.