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Arch Otolaryngol Head Neck Surg. 2005;131:184-185.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

Diagnosis: Giant intrasphenoidal aneurysm of the left internal carotid artery (ICA)

Giant intrasphenoidal aneurysms of the ICA are extremely rare and potentially disastrous because of the risk of fatal epistaxis. Even more unusual is the fissuring of the aneurysm, which may be the forerunner of rupture. Indeed, the risk of rebleeding is high, approximately 20% to 50% in the first 2 weeks.¹ The present case was successfully treated, although recent, repeated epistaxis looked like an unpromising outcome.

The differential diagnosis in the present case included a tumor of the sphenoidal sinus because of (1) the presence of a contrast-enhanced mass measuring 32 x 22 mm; (2) extensive bone erosion of the anterior sellar wall, left clinoid process, and lateral wall of the sphenoidal sinus; and (3) displacement of the septum (Figure 1). Another potential differential consideration was that of a mucocele, with proteinaceous secretions or polyps accounting for the increased density on the computed tomographic scan (Figure 1. . . [Full Text of this Article]

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