Although external dacryocystorhinostomy is still preferred by most ophthalmologists, the authors describe the endonasal approach. They comment their preliminary results with 25 endonasal dacryocystorhinostomies.
Eloy, P., Watelet, J. B., Claramunt, R., Martinez, M., Bertrand, B., Hoebeke, M., & Sempous, P. (1994). La dacryocystorhinostomie ab interno : Considérations générales et résultats préliminaires. Bulletin de la Société belge d’ophtalmologie, 252, 31-34. https://hdl.handle.net/2078.5/130486 (Original work published 1994)