Abstract
Purpose
To elucidate the question whether expansion of pituitary adenomas into the cavernous sinus (CS) has to be regarded as focal penetration rather than invasion, a microanatomical study of the medial wall (MW) of the CS was performed.
Method
Fourteen sellar hemiblocks underwent microsurgical dissection from lateral and medial approach. The thickness of the MW of the CS was examined by diaphanoscopy.
Findings
The internal carotid artery (ICA) was adherent to the MW in five cases. In five specimens the lateral wall of the sella turcica consisted of a single layer without perforations. In nine cases this wall had two layers. There was no perforation of both layers in any case. Diaphanoscopy revealed thin MW in the lateral border of the sella (n = 13), below the horizontal segment of the ICA (n = 10), and antero-inferiorly to the carotid syphon (n = 9).
Conclusions
Expansion into the CS may be facilitated by low anatomical resistance against chronic tumor growth.
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Comment
The authors present an interesting paper that addresses the clinical problem of invasion of the cavernous sinus by pathological processes, specifically pituitary tumors. They elegantly demonstrate the microanatomy of the medial wall of the cavernous sinus and, in so doing, help readers to better understand the anatomical reasons that explain how these tumors can grow into the cavernous sinus.
Mario Zuccarello
Mayfield Clinic, Cincinnati, OH
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Knappe, U.J., Konerding, M.A. & Schoenmayr, R. Medial wall of the cavernous sinus: microanatomical diaphanoscopic and episcopic investigation. Acta Neurochir 151, 961–967 (2009). https://doi.org/10.1007/s00701-009-0340-3
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DOI: https://doi.org/10.1007/s00701-009-0340-3