• Hiroyuki Jimbo, Megumi Ichikawa, Shinjiro Fukami, Kunitoshi Otsuka, Jyunya Tsurukiri, Shigeki Sunaga, and Yukio Ikeda.
• Department of Neurosurgery, Tokyo Medical University Hachioji Medical Center, Tokyo, Japan. Electronic address: hjimbo@tokyo-med.ac.jp.
• World Neurosurg. 2016 Apr 1; 88: 690.e11-690.e16.

BackgroundSpontaneous rupture of a Rathke cleft cyst is very rare, and rapid de novo aneurysm formation associated with pituitary apoplexy is rare.Case DescriptionA 66-year-old woman experienced severe left temporal pain. Magnetic resonance imaging showed a Rathke cleft cyst, and transsphenoidal surgery was planned. However, the patient suddenly developed severe headache, vomiting, visual disturbance, and a lowered level of consciousness about 3 weeks after the first onset. The clinical course and neuroradiologic characteristics suggested Rathke cleft cyst rupture. The patient received hormone replacement, and the visual abnormalities resolved. However, subsequent neuroradiologic evaluation demonstrated that a de novo aneurysm in the cavernous sinus portion of the internal carotid artery had formed within 8 days after rupture of the Rathke cleft cyst. This de novo aneurysm was not apparent on initial magnetic resonance angiography.ConclusionsThis case features a rare clinical presentation of rapid de novo aneurysm formation after Rathke cleft cyst rupture. The severe inflammation around the vasculature after rupture of the Rathke cleft cyst might have been involved in aneurysm formation.Copyright © 2016 Elsevier Inc. All rights reserved.

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