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Absent Stapedial Tendon: Imaging Features of an Underrecognized Entity

Clinical Neuroradiology

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Abstract

Purpose

Congenital absence of the stapedial tendon is a rare entity with characteristic imaging findings, which can go unrecognized due the scarcity of the diagnosis and limited previous description in the imaging literature. We aim to characterize the imaging features of this entity.

Methods

A series of 9 cases with surgical confirmation of stapedial tendon absence were retrospectively reviewed and the most common abnormalities on high resolution computed tomography (CT) of the temporal bone described.

Results

Congenital fixation of the stapes footplate was present in nearly all cases of stapedial tendon absence (n = 8, 89%), a clinically important association because the stapes footplate abnormality was not detectable on preoperative CT. Absence or hypoplasia of the pyramidal eminence and aperture was identified in almost all cases (n = 8, 89%), which may be the sole imaging finding to suggest stapedial tendon absence and associated stapes footplate fixation prior to surgery.

Conclusion

The most reliable indicator of stapedial muscle absence on temporal bone CT is the absence or hypoplasia of the pyramidal eminence and aperture. Importantly, most patients had congenital stapes footplate fixation confirmed intraoperatively with a normal stapes footplate on CT, meaning the pyramidal eminence/aperture abnormality was the only preoperative imaging finding that could have suggested the footplate fixation.

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Funding

The authors did not receive support from any organization for the submitted work.

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Brian J. Burkett, Michael P. Oien, John C. Benson, Ashley M. Nassir, Matthew L. Carlson, and John I. Lane. The first draft of the manuscript was written by Brian Burkett and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Brian J. Burkett.

Ethics declarations

Conflict of interest

B.J. Burkett, M.P. Oien, J.C. Benson, A.M. Nassiri, M.L. Carlson and J.I. Lane declare that they have no competing interests.

Ethical standards

This research study was conducted retrospectively from data obtained for clinical purposes. This work was conducted following approval by the Mayo Clinic Institutional Review Board. Informed consent was not obtained for the retrospectively collected images and clinical data in this case series. The retrospective review was conducted with Institutional Review Board approval. No identifying information is presented in this publication. The clinical data and CT images are deidentified.

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Burkett, B.J., Oien, M.P., Benson, J.C. et al. Absent Stapedial Tendon: Imaging Features of an Underrecognized Entity. Clin Neuroradiol 33, 645–651 (2023). https://doi.org/10.1007/s00062-022-01251-1

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  • DOI: https://doi.org/10.1007/s00062-022-01251-1

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