Abstract
Purpose
To compare the findings of MR dacryocystography with those of dacryoendoscopy and subsequent surgery in patients with nasolacrimal duct obstruction, and to determine the efficacy of MR dacryocystography in the positional diagnosis of nasolacrimal duct obstruction.
Materials and methods
Thirty-one patients with clinically suspected nasolacrimal duct obstruction who underwent MR dacryocystography and dacryoendoscopy with subsequent surgical procedure were included. MR dacryocystography was performed by using heavily T2-weighted fast spin echo sequence in the coronal and axial planes after the topical administration of normal saline drops into the conjunctival sacs.
Results
In MR dacryocystography, stenosis/obstruction at the canalicular level was correctly diagnosed in nine patients (100 %). Stenosis/obstruction at the lacrimal sac level was correctly diagnosed in 14 of 16 patients (87.5 %) in MR dacryocystography. Three patients with coexistent stenosis/obstruction at both the canalicular and the lacrimal sac level were misinterpreted as stenosis/obstruction at the canalicular level on MR dacryocystography. The overall accuracy of MR dacryocystography in depicting stenosis/obstruction was 84 %.
Conclusions
MR dacryocystography after the topical administration of normal saline drops into the conjunctival sacs is a well-tolerated, minimally invasive imaging technique to identify the level of stenosis/obstruction in patients with nasolacrimal duct obstruction before dacryoendoscopy and subsequent surgery.
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Acknowledgments
We thank Dr. Jou Sakai, Department of Ophthalmology, Kasai City Hospital, for technical procedure of dacryoendoscopy.
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Hiroki Higashi declares that he has no conflict of interest. Tsutomu Tamada declares that he has no conflict of interest. Kenichi Mizukawa declares that he has no conflict of interest. Katsuyoshi Ito declares that he has no conflict of interest.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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This retrospective study was approved by our institutional review board, and the requirement for informed consent was waived.
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Higashi, H., Tamada, T., Mizukawa, K. et al. MR dacryocystography: comparison with dacryoendoscopy in positional diagnosis of nasolacrimal duct obstruction. Radiol med 121, 580–587 (2016). https://doi.org/10.1007/s11547-016-0632-7
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DOI: https://doi.org/10.1007/s11547-016-0632-7