In brain tumor imaging, a ring-enhancing lesion on MRI most commonly suggests which of the following?

In brain tumor imaging, a ring-enhancing lesion on MRI most commonly suggests which of the following?

• A. Benign lesion without necrosis
• B. Edema without a mass
• C. A mass with central necrosis and edema; histology needed for diagnosis
• D. A purely cystic lesion with no solid component

Answer: (C)

Ring enhancement happens when contrast leaks at the edge of a lesion because the blood-brain barrier is disrupted there. The center often remains non-enhancing because it’s necrotic or cystic. This pattern is most consistent with a mass that has central necrosis and surrounding edema, which is a common feature of high-grade brain tumors where rapid growth outpaces blood supply. Since ring enhancement can also be seen with other processes, tissue diagnosis is needed to determine the exact histology.

Ring enhancement happens when contrast leaks at the edge of a lesion because the blood-brain barrier is disrupted there. The center often remains non-enhancing because it’s necrotic or cystic. This pattern is most consistent with a mass that has central necrosis and surrounding edema, which is a common feature of high-grade brain tumors where rapid growth outpaces blood supply. Since ring enhancement can also be seen with other processes, tissue diagnosis is needed to determine the exact histology.