Fig 3. A 38-year-old woman presenting with progressive visual field deficit. A, Giant carotid hypophyseal aneurysm compressing the chiasm treated with balloon-assisted coiling. Angiographic test occlusion was not tolerated. B, MR imaging at 3 intervals after coiling. At 12 months, the aneurysm has increased in size from 24 to 31 mm. Size is stable during an interval of 12 to 24 months. C, Perimetric results before coiling and different intervals thereafter. Incomplete hemianopsia before coiling. At 12 months, increased aneurysmal size caused progressive hemianopsia that gradually decreased at 17 and 29 months. Final result was classified as unchanged.