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2 Cards in this Set
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1. What is the classic MRI appearance of cavernomas?
2. How do you differentiate a cavernoma from a simple hemorrhage? 3. How do you differentiate a cavernoma from a hemorrhagic tumor? |
1. MRI demonstrates a popcorn lesion with mixed signal intensities representing various stages of hemorrhage
2, On follow up, cavernomas do not collapse into slit-like cavities, but rather maintain their rounded shape; whereas, simple hemorrhages often collapse 3. Cavernomas have complete hemosiderin rings; whereas, tumors usually do not. |
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1. What is an arteriovenous malformation?
2. What are the MRI/CT findings? |
1. Congenital anomaly of blood vessel development resulting in direct communication between arterial and venous channels without an intervening capillary network. There is a nidus composed of tangled abnormal vessels connecting arteries and draining veins.
2. Look for flow voids on MRI. CT may demonstrate a hyperattenuating area with or without calcifications. |
