For suspected glioblastoma multiforme, what is the initial imaging study of choice?

For suspected glioblastoma multiforme, what is the initial imaging study of choice?

• A. CT without contrast
• B. PET scan
• C. X-ray
• D. MRI with contrast

Answer: (D)

MRI with gadolinium contrast is the best initial imaging for suspected glioblastoma. MRI offers superior soft tissue contrast and allows imaging in multiple planes, which helps precisely define the tumor’s extent, edema, and involvement of surrounding brain structures. Gadolinium contrast highlights areas where the blood-brain barrier is disrupted, producing the typical irregular, often ring-enhancing appearance of glioblastoma and helping distinguish tumor tissue from surrounding edema. This level of detail and the ability to assess diffusion, perfusion, and surrounding changes are not matched by CT alone or by PET as a first study. CT can miss subtle lesions and is less sensitive for defining tumor margins and infiltrative spread. Therefore, MRI with contrast provides the most accurate initial assessment.

MRI with gadolinium contrast is the best initial imaging for suspected glioblastoma. MRI offers superior soft tissue contrast and allows imaging in multiple planes, which helps precisely define the tumor’s extent, edema, and involvement of surrounding brain structures. Gadolinium contrast highlights areas where the blood-brain barrier is disrupted, producing the typical irregular, often ring-enhancing appearance of glioblastoma and helping distinguish tumor tissue from surrounding edema. This level of detail and the ability to assess diffusion, perfusion, and surrounding changes are not matched by CT alone or by PET as a first study. CT can miss subtle lesions and is less sensitive for defining tumor margins and infiltrative spread. Therefore, MRI with contrast provides the most accurate initial assessment.