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Diffusion MR imaging of giant cell tumors in tuberous sclerosis
1Department of Radiology, Ege University Hospital Bornova, Izmir, Turkey. rnsener@med.ege.edu.tr
Abstract:
Giant cell tumors were studied by diffusion MR imaging in three patients with tuberous sclerosis. Diffusion MR imaging was performed on a 1.5-T unit with a gradient strength of 30 mT/m. b = 1000 seconds/mm2 images, and apparent diffusion coefficient (ADC) maps were studied. ADC values were recorded from ADC maps with particular care to obtain the values from the noncalcified regions of the giant cell tumors. ADC values of the normal brain parenchyma and hamartomas were also recorded by multiple evaluations. The ADC values in all three giant cell tumors (0.78, 0.92, and 0.92 x 10-3mm2/s) were within the ranges of the normal brain parenchyma (0.62-1.04 x 10-3mm2/s), and they were prominently less than those of parenchymal hamartomas (1.18-1.86 x 10-3mm2/s). The finding of ADC values of the noncalcified portions of the giant cell tumors being identical to those of normal brain parenchyma is consistent with the presence of normal molecular motion of water, hence relatively normal tissue integrity within these tumors. This was likely a reflection of benignity of these slowly growing tumors.
Insights
Diffusion MRI reveals giant cell tumors in tuberous sclerosis patients have normal apparent diffusion coefficient (ADC) values, similar to normal brain tissue. This suggests benignity and normal tissue integrity in these tumors.
Area of Science:
- Neuroradiology
- Oncology
- Medical Imaging
Background:
- Tuberous sclerosis is a genetic disorder that can lead to the development of giant cell tumors, primarily in the brain.
- Diffusion Magnetic Resonance Imaging (dMRI) is a non-invasive technique that measures the random motion of water molecules to assess tissue microstructure.
Observation:
- Three patients with tuberous sclerosis and giant cell tumors underwent dMRI on a 1.5-T scanner.
- Apparent Diffusion Coefficient (ADC) values were calculated from ADC maps, focusing on non-calcified tumor regions, normal brain parenchyma, and hamartomas.
Findings:
- Giant cell tumors exhibited ADC values (0.78–0.92 x 10^-3 mm²/s) comparable to normal brain parenchyma (0.62–1.04 x 10^-3 mm²/s).
- Tumor ADC values were significantly lower than those of parenchymal hamartomas (1.18–1.86 x 10^-3 mm²/s).
- The similarity in ADC values between tumors and normal brain suggests normal water diffusion and tissue integrity.
Implications:
- The diffusion characteristics indicate that non-calcified giant cell tumors in tuberous sclerosis are likely benign and slow-growing.
- dMRI, specifically ADC mapping, can aid in differentiating giant cell tumors from other brain lesions in tuberous sclerosis.
- These findings support the use of dMRI for characterizing brain tumors in genetic disorders.
