• Rei Yamaguchi, Hideaki Kohga, Masahiko Tosaka, Akiko Sekine, Kazuyuki Mizushima, Yasuo Harigaya, and Yuhei Yoshimoto.
• Department of Neurosurgery, General Fujioka Hospital, Fujioka, Gunma, Japan; Department of Neurosurgery, Japanese Red Cross Maebashi Hospital, Maebashi, Gunma, Japan. Electronic address: rei.yamaguchi@maebashi.jrc.or.jp.
• World Neurosurg. 2016 Sep 1; 93: 488.e1-4.

BackgroundOptic neuritis (ON) is unilateral painful optic nerve inflammation in a young healthy female diagnosed by excluding glaucoma. ON onset during pregnancy is rare, with only 2 cases reported to date.Case DescriptionA 35-year-old previously healthy parous woman who was pregnant with her second child suffered rapidly progressive visual acuity loss. Magnetic resonance imaging (MRI) revealed a pituitary tumor. Emergency surgery was performed for optic nerve compression; however, her visual impairment worsened. Postoperative diffusion-weighted MRI showed high intensity in the bilateral optic nerves, and ON was diagnosed. Administration of methylprednisolone was effective, and her visual acuity recovered over 6 months.ConclusionsAssociated pituitary macroadenoma complicated the true diagnosis of ON, because contrast medium cannot be used in pregnant women. The diffusion-weighted MRI findings were useful for diagnosing this complex clinical condition.Copyright © 2016 Elsevier Inc. All rights reserved.

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