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01.02.2009 | Original Article

Clinical anatomy of the mastoid and occipital emissary veins in a large series

verfasst von: Robert G. Louis Jr, Marios Loukas, Christopher T. Wartmann, R. Shane Tubbs, Nihal Apaydin, Ankmalika A. Gupta, Gergios Spentzouris, Jacqueline R. Ysique

Erschienen in: Surgical and Radiologic Anatomy | Ausgabe 2/2009

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Abstract

Introduction

Detailed descriptions of the mastoid emissary veins (MEVs) and the foramina through which they travel are lacking in the literature. Therefore, the aim of our study was to explore and delineate the morphology, topography and morphometry of the MEV, mastoid foramen (MF) and occipital foramen (OF). One hundred cadaver heads and 100 dried human skulls were grossly examined

Results

The MF and OF varied from being absent to having as many as four small openings, each transmitting an emissary vein. The overall prevalence of MEV was 98% on the right and 72% on the left. The overall prevalence of OF was 7% on the right and 4% on the left. The mean length of the MEV from its point of origin to its point of termination was found to be 7.2 cm with a range of 3.8–11.8 cm. The mean diameter of the MEV at the mastoid emissary foramen was 3.5 mm with a range of 1.1–5.6 mm. In the majority of the cadavers (85%) it was observed that mastoid and occipital emissary veins formed a confluent venous system, while in the remaining 15%, they remained as single vessels.

Conclusions

The MEV may be a significant source of bleeding during surgery of the skull base or middle ear, particularly during retrosigmoid and far-lateral approaches and detailed anatomical knowledge may help to prevent these complications. Endovascular treatment of dural arteriovenous fistulas is often extremely difficult due to limited access, however, the use of the MEV represents a unique and potentially valuable technique for accessing an isolated or inaccessible transverse or sigmoid sinus system.

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Titel: Clinical anatomy of the mastoid and occipital emissary veins in a large series
verfasst von: Robert G. Louis Jr
Marios Loukas
Christopher T. Wartmann
R. Shane Tubbs
Nihal Apaydin
Ankmalika A. Gupta
Gergios Spentzouris
Jacqueline R. Ysique
Publikationsdatum: 01.02.2009
Verlag: Springer-Verlag
Erschienen in: Surgical and Radiologic Anatomy / Ausgabe 2/2009
Print ISSN: 0930-1038
Elektronische ISSN: 1279-8517
DOI: https://doi.org/10.1007/s00276-008-0423-5

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Clinical anatomy of the mastoid and occipital emissary veins in a large series