open access

Vol 76, No 2 (2017)
Case report
Submitted: 2016-07-19
Accepted: 2016-08-21
Published online: 2016-10-10
Get Citation

Ectopic arachnoid granulation involving a rare intracranial venous sinus variant

R. Umeh1, M. Loukas1, R. J. Oskouian2, R. S. Tubbs12
·
Pubmed: 27813633
·
Folia Morphol 2017;76(2):319-321.
Affiliations
  1. Department of Anatomical Sciences, St. George’s University, True Blue, Grenada, West Indies, Grenada
  2. Seattle Science Foundation, Seattle, Washington, United States, United States

open access

Vol 76, No 2 (2017)
CASE REPORTS
Submitted: 2016-07-19
Accepted: 2016-08-21
Published online: 2016-10-10

Abstract

Arachnoid granulations are hypertrophied arachnoid villi, which extend from the subarachnoid space into the venous system and aid in the passive filtration and reabsorption of cerebrospinal fluid. These macroscopic structures have been described in various locations, with the transverse and sigmoid sinuses seen as normal variants on imaging. Here we present the occurrence of an enlarged arachnoid granulation at the foramen rotundum where a variant intracranial venous sinus was identified during routine dissection. Variations, such as the one described herein, should be recognised by those who operate or interpret images of the skull base.

Abstract

Arachnoid granulations are hypertrophied arachnoid villi, which extend from the subarachnoid space into the venous system and aid in the passive filtration and reabsorption of cerebrospinal fluid. These macroscopic structures have been described in various locations, with the transverse and sigmoid sinuses seen as normal variants on imaging. Here we present the occurrence of an enlarged arachnoid granulation at the foramen rotundum where a variant intracranial venous sinus was identified during routine dissection. Variations, such as the one described herein, should be recognised by those who operate or interpret images of the skull base.

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Keywords

arachnoid granulations, intracranial venous sinus, foramen rotundum

About this article
Title

Ectopic arachnoid granulation involving a rare intracranial venous sinus variant

Journal

Folia Morphologica

Issue

Vol 76, No 2 (2017)

Article type

Case report

Pages

319-321

Published online

2016-10-10

Page views

1322

Article views/downloads

1382

DOI

10.5603/FM.a2016.0062

Pubmed

27813633

Bibliographic record

Folia Morphol 2017;76(2):319-321.

Keywords

arachnoid granulations
intracranial venous sinus
foramen rotundum

Authors

R. Umeh
M. Loukas
R. J. Oskouian
R. S. Tubbs

References (9)
  1. Chen F, Deng Xf, Liu B, et al. Arachnoid granulations of middle cranial fossa: a population study between cadaveric dissection and in vivo computed tomography examination. Surg Radiol Anat. 2011; 33(3): 215–221.
  2. Hollinshead WH. Anatomy for Surgeons: The Head and Neck. New York: Harper & Row. ; 1968.
  3. Kan P, Stevens EA, Couldwell WT. Incidental giant arachnoid granulation. AJNR Am J Neuroradiol. 2006; 27(7): 1491–1492.
  4. Keyzer BD, Bamps S, Calenbergh FV, et al. Giant arachnoid granulations mimicking pathology. Neuroradiol J. 2014; 27: 0.
  5. le Gros Clark WE. On the Pacchionian Bodies. J Anat. 1920; 55(Pt 1): 40–48.
  6. Leach JL, Meyer K, Jones BV, et al. Large arachnoid granulations involving the dorsal superior sagittal sinus: findings on MR imaging and MR venography. AJNR Am J Neuroradiol. 2008; 29(7): 1335–1339.
  7. Miyajima M, Arai H. Evaluation of the Production and Absorption of Cerebrospinal Fluid. Neurol Med Chir (Tokyo). 2015; 55(8): 647–656.
  8. Roche J, Warner D. Arachnoid granulations in the transverse and sigmoid sinuses: CT, MR, and MR angiographic appearance of a normal anatomic variation. AJNR Am J Neuroradiol. 1996; 17(4): 677–683.
  9. Trimble CR, Harnsberger HR, Castillo M, et al. "Giant" arachnoid granulations just like CSF?: NOT!! AJNR Am J Neuroradiol. 2010; 31(9): 1724–1728.

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