Natural history of postoperative aneurysm rests

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✓ In a series of 715 patients operated on by microsurgical techniques for intracranial saccular aneurysms between 1970 and 1980, part of the aneurysmal sac was not obliterated in 28 aneurysms in 27 patients (3.8% of 715 cases). Clinical follow-up evaluation for 8 years (range 4 to 13 years) and angiographic follow-up studies for 6 years (range 2 to 10 years) in these 27 cases revealed that one aneurysm rest increased in size and bled twice, five were spontaneously obliterated, two decreased in size, 13 remained unchanged, and in seven cases no late follow-up angiography was performed. The incidence of rebleeding from an aneurysm rest was 3.7% of the 27 in whom the sac was not obliterated and 0.14% of all 715 patients who were operated on.

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Address for Dr. Feuerberg: Hospital de Clinicas, Caracas, Av. Alameda, San Bernardino, Caracas 1010, Venezuela.Address reprint requests to: Ladislau Steiner, M.D., Ph.D., Department of Neurosurgery, Karolinska Hospital, S-104 01 Stockholm, Sweden.
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