title: The oblique occipital sinus: anatomical study using bone subtraction 3D CT venography.
abstract: OBJECTIVE
  An occipital sinus draining into the sigmoid sinus has been termed the oblique occipital sinus (OOS). The frequency, anatomical features, patterns, and relationship with the transverse sinus of the oblique occipital sinus were analyzed in this study.
  
  
  METHODS
  The study included 1805 patients who underwent brain CT angiography during a 3-year period from 2013 to 2015. CT examinations were performed using a 64-slice MDCT system.
  
  
  RESULTS
  The OOS was identified in 41 patients (2.3%). There were many anatomical variations in the oblique occipital sinuses. A hypoplastic or aplastic TS was seen in 31 (75.6%) of the 41 patients with OOS.
  
  
  CONCLUSIONS
  Many anatomical variations in the oblique occipital sinus can be seen on CT venography. Some OOSs function as the main drainage route of the intracranial veins instead of the TS. Thus, careful examination is essential for preoperative evaluation in posterior fossa lesions.
authors: Department of Radiology, Gyeongsang National University Hospital, 79, Gangnam-ro, Jinju-si, Gyeongsangnam-do, 52727, South Korea.
authors: Hwa Seon
authors: HS
authors: Shin
authors: Department of Radiology, Gyeongsang National University Hospital, 79, Gangnam-ro, Jinju-si, Gyeongsangnam-do, 52727, South Korea. choids@gnu.ac.kr.
authors: Dae Seob
authors: DS
authors: Choi
authors: Department of Radiology, Gyeongsang National University School of Medicine, Gyeongsang National University Changwon Hospital, Changwon-si, South Korea.
authors: Hye Jin
authors: HJ
authors: Baek
authors: Department of Radiology, Gyeongsang National University Hospital, 79, Gangnam-ro, Jinju-si, Gyeongsangnam-do, 52727, South Korea.
authors: Ho Cheol
authors: HC
authors: Choi
authors: Department of Radiology, Gyeongsang National University Hospital, 79, Gangnam-ro, Jinju-si, Gyeongsangnam-do, 52727, South Korea.
authors: Hye Young
authors: HY
authors: Choi
authors: Department of Radiology, Gyeongsang National University Hospital, 79, Gangnam-ro, Jinju-si, Gyeongsangnam-do, 52727, South Korea.
authors: Mi Jung
authors: MJ
authors: Park
authors: Department of Radiology, Gyeongsang National University Hospital, 79, Gangnam-ro, Jinju-si, Gyeongsangnam-do, 52727, South Korea.
authors: Ji Eun
authors: JE
authors: Kim
authors: Department of Anesthesiology and Pain Medicine, Gyeongsang National University Changwon Hospital, Changwon-si, South Korea.
authors: Jeong Yeol
authors: JY
authors: Han
authors: Department of Radiology, Gyeongsang National University Hospital, 79, Gangnam-ro, Jinju-si, Gyeongsangnam-do, 52727, South Korea.
authors: SungEun
authors: S
authors: Park
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D059925:Anatomic Landmarks; D002550:Cerebral Veins / Q000000981:diagnostic imaging*; D002648:Child; D000072226:Computed Tomography Angiography / Q000379:methods*; D003392:Cranial Sinuses / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008297:Male; D008875:Middle Aged; D010690:Phlebography; D013382:Subtraction Technique
keywords: CT venography; Oblique occipital sinus; Transverse sinus