• Takeshi Fujimori, Atsushi Shindo, Daisuke Ogawa, Masaki Okada, Tetsuhiro Hatakeyama, Masanobu Okauchi, Masahiko Kawanishi, Keisuke Miyake, and Takashi Tamiya.
• Department of Neurological Surgery, Faculty of Medicine, Kagawa University, Kita-gun, Kagawa, Japan. Electronic address: fujimori@med.kagawa-u.ac.jp.
• World Neurosurg. 2019 Jul 1; 127: 160-164.

BackgroundSymptomatic cyst formation after brain tumor resection is a rare complication of the early postoperative phase. We describe a complicated case of postoperative symptomatic cyst formation after gross total removal of a convexity meningioma.Case DescriptionA 59-year-old woman presented with recent onset motor aphasia. Magnetic resonance imaging revealed a left convexity tumor. We performed gross total resection of the tumor, which was pathologically diagnosed as an atypical meningioma. Tumor resection and decompression of the normal cerebral hemisphere improved aphasia. However, 3 days after surgery, her motor aphasia worsened. Computed tomography scan confirmed that the frontal lobe was being compressed by an enlargement of the postoperative tumor cavity. Conservative therapy did not shrink the cavity, and her motor aphasia persisted. Therefore, 21 days after surgery, a drainage tube was inserted into the enlarged cavity using a neuroendoscope, which promoted shrinkage of the cavity and improved her motor aphasia. We suspected that the enlargement of the postoperative cavity was because of the presence of a valve-like structure.ConclusionsEven though formation of symptomatic cystic lesions after brain tumor resection is rare, neurosurgeons should be aware of such early postoperative complications and their management strategies.Copyright © 2019 Elsevier Inc. All rights reserved.

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