title: Relationship between Gyrus Rectus Resection and Cognitive Impairment after Surgery for Ruptured Anterior Communicating Artery Aneurysms.
abstract: OBJECTIVE
  The gyrus rectus (GR) is known as a non-functional gyrus; hence, its resection is agreed to be a safe procedure frequently practiced to achieve a better surgical view during specific surgeries. This study aimed at comparing the cognitive outcomes following GR resection in patients who underwent surgery for ruptured anterior communicating artery (ACoA) aneurysms.
  
  
  METHODS
  From 2012 to 2015, 39 patients underwent surgical clipping for ruptured ACoA aneurysms. Mini-mental state examinations (MMSE) were performed in 2 different periods. The statistical relationship between GR resection and MMSE results was evaluated, and further analysis of MMSE subgroup was performed.
  
  
  RESULTS
  Twenty-five out of the 39 patients (64.19%) underwent GR resection. Mean initial and final MMSE scores in the GR resection group were 16.3 ± 9.8 and 20.8 ± 7.3, respectively. In the non-resection group, the mean initial and final MMSE scores were 17.1 ± 8.6 and 21.9 ± 4.5, respectively. Neither group's scores showed a significant change. Subgroup analysis of initial MMSE showed a significant difference in memory recall and language (p= 0.02) but not in the final MMSE scores.
  
  
  CONCLUSIONS
  There was no significant relationship between the GR resection and cognitive outcomes in terms of total MMSE scores after surgery for ruptured ACoA aneurysm. However, subgroup analysis revealed a temporary negative effect of GR resection in the categories of language and memory recall. This study suggests that GR resection should be executed superficially, owing to its close anatomical relationship with the limbic system.
authors.affiliation: Department of Neurosurgery, Konkuk University Medical Center, Seoul, Korea.
authors.forename: Myung Sung
authors.initials: MS
authors.lastname: Joo
authors.affiliation: Department of Neurosurgery, Konkuk University Medical Center, Seoul, Korea.
authors.forename: Dong Sun
authors.initials: DS
authors.lastname: Park
authors.affiliation: Department of Neurosurgery, Konkuk University Medical Center, Seoul, Korea.
authors.forename: Chang Taek
authors.identifier: 0000-0001-5286-0406
authors.initials: CT
authors.lastname: Moon
authors.affiliation: Department of Neurosurgery, Konkuk University Medical Center, Seoul, Korea.
authors.forename: Young Il
authors.initials: YI
authors.lastname: Chun
authors.affiliation: Department of Neurosurgery, Konkuk University Medical Center, Seoul, Korea.
authors.forename: Sang Woo
authors.initials: SW
authors.lastname: Song
authors.affiliation: Department of Radiology, Konkuk University Medical Center, Seoul, Korea.
authors.forename: Hong Gee
authors.initials: HG
authors.lastname: Roh
keywords: Anterior communicating artery; Gyrus rectus; MMSE