Classification of CSDHs according to the internal architecture and intracranial extension may be useful for predicting the risk of postoperative recurrence.

The incidence of postoperative fluid reaccumulation seems to be reduced by placing the tip of the drainage catheter in the frontal convexity and by removing subdural air during or after surgery.

A rare case is presented in which a foreign-body granuloma developed at the site of muslin wrapping and Aron Alpha A coating of an internal carotid artery aneurysm. The importance of avoiding the use of muslin, especially close to the optic nerve and chiasm, is emphasized.

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