Directions: Read the following case study and answer the questions at the end of the case.
The patient was admitted on January 14 with a Hx of progressive right hemiparesis for the previous 1 to 2 months; fluctuating numbness of the right arm, thorax, and buttocks; jerking of the right leg; periods of speech arrest; diminished comprehension in reading and recent development of a hemiplegic gait. He is suspected of having a left parietal tumor. Examinations done before hospitalization included skull films, EEG, and CSF analysis, which were all normal. After admission, an MRI was abnormal in the left parietal region, as was the EEG. An MRA to assess cerebral blood vessels was attempted, but the patient became progressively more restless and agitated after sedation, so the procedure was stopped. During the recovery phase from the sedation, the patient was alternately somnolent and violent, but it was later apparent that he had developed almost a complete aphasia and right hemiplegia. In the next few days, he became more alert, although he remained dysarthric and hemiplegic. MRI and MRA under general anesthesia on January 19 showed complete occlusion of the left internal carotid artery with cross-filling of the left anterior and middle cerebral arteries from the right internal carotid circulation. Final Dx: Left cerebral infarction caused by left internal carotid artery occlusion.
Describe the reason for this patient's admission (don't just repeat what is written in the case-explain it). How does this patient walk? Where is this patient's tumor located? What is the difference between an MRI and an MRA? Describe in lay terms the patient's condition during recovery after the attempted MRA. What is the final diagnosis(es) in common terms?