Mastoid pouch of the sigmoid sinus- an extraordinary anatomical variant.

ABSTRACT:

Purpose

The dural sigmoid sinus (SS) is a major surgical landmark. It is aimed to report an extraordinary and clinically significant anatomical variation- the mastoid pouch of the SS, which replaces the mastoid air cells.

Method

The archived angioCT file of a 45 y.o. male was retrospectively studied on planar sections and by three-dimensional volume renderings.

Results

An expansive mastoid pouch of the left SS was found, measuring 1.74 cm in transverse diameter and 2.18 cm in sagittal diameter, replacing the typical mastoid air cell system. This SS pouch extended to the mastoid cortex and was covered by a robust (1.41 cm broad) tegmen sinus sigmoidei. The bony wall between the SS pouch and the mastoid portion of the facial canal was 4.65 mm thick.

Conclusion

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SUBMITTER: Rusu MC 

PROVIDER: S-EPMC11835970 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature