67 year old man is brought to the physcian for a follow-up examination. One month ago, he had sudden loss of consciousness. When he regained consciousness 30minutes later, he could not movehis right upper and lower extremties. Physical examination today shows loss of motor functions on the right side. A CT scan of the head shows a large cystic area in the parietal lobe. Which of the following processes best expalins the cystic changes in this patient

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