Giant serpentine aneurysms: a separate entity.

Giant intracranial aneurysms containing a tortuous vascular channel appear, to some extent, different from other giant aneurysms. Their particular features are outlined in the present report which concerns a case of a small fusiform aneurysm of the posterior temporal branch of the middle cerebral artery evolving over five years into a giant serpentine aneurysm. Successful and complete removal of this lesion was achieved.