In 1958 Gillingham popularized wrapping with cotton or muslin 1). An analysis of 60 patients showed that 8.5% rebled in ≤ 6 mos, and the annual rebleeding rate was 1.5% thereafter 2) (similar to the natural history)

1)
Gillingham FJ. The Management of Ruptured Intracranial Aneurysms. Hunterian Lecture. Ann R Coll Surg Engl. 1958; 23:89–117
2)
Todd NV, Tocher JL, Jones PA, et al. Outcome Following Aneurysm Wrapping: A 10-Year Follow-Up Review of Clipped and Wrapped Aneurysms. J Neurosurg. 1989; 70:841–846