Brain tumors: MR imaging with gadolinium-DTPA

Area of Science:

• Neuroradiology
• Medical Imaging
• Oncology

Background:

• Intracranial tumors present diagnostic challenges in Magnetic Resonance (MR) imaging.
• Precontrast MR imaging can visualize tumors but often struggles with differentiating them from adjacent tissues.

Purpose of the Study:

• To evaluate the efficacy of gadolinium-DTPA (Gd-DTPA) contrast agent in improving the delineation of intracranial tumors using MR imaging.
• To assess the diagnostic improvement provided by contrast-enhanced MR imaging for various tumor types.

Main Methods:

• MR imaging was conducted on 40 patients with intracranial tumors before and after intravenous Gd-DTPA administration.
• A comprehensive protocol of spin-echo sequences was used for precontrast studies.
• Tumor visualization and delineation were assessed both pre- and post-contrast administration.

Main Results:

• While tumors were visualized precontrast, accurate differentiation from adjacent tissues was only possible in 17 of 40 cases.
• Gd-DTPA administration resulted in increased signal intensity in all tumors, significantly improving delineation in 36 of 40 patients.
• Glioblastomas and intracranial metastases specifically required Gd-DTPA for diagnostically sufficient display.

Conclusions:

• Gd-DTPA is a valuable contrast agent for enhancing the diagnostic accuracy of MR imaging in patients with intracranial tumors.
• Contrast-enhanced MR imaging is crucial for effective tumor delineation, particularly for aggressive and infiltrative tumor types.