RT Journal Article SR Electronic T1 Imaging Features of Malignant Lacrimal Sac and Nasolacrimal Duct Tumors JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 2134 OP 2137 DO 10.3174/ajnr.A4882 VO 37 IS 11 A1 V.A. Kumar A1 B. Esmaeli A1 S. Ahmed A1 B. Gogia A1 J.M. Debnam A1 L.E. Ginsberg YR 2016 UL http://www.ajnr.org/content/37/11/2134.abstract AB SUMMARY: The purpose of this study was to present the imaging features of primary and secondary malignant lacrimal sac and nasolacrimal duct tumors and their pattern of tumor spread in 18 patients. The most common tumor histology in our series was squamous cell carcinoma. In 15/18 patients, tumor involved both the lacrimal sac and duct at the time of diagnosis. In 11/16 patients on CT, the nasolacrimal bony canal was smoothly expanded without erosive changes. The medial canthus region (16/18) was a frequent site of direct tumor spread. Two patients had intraconal orbital spread of tumor. Tumor spread to the sinus or nasal cavity was observed in 5/13 primary tumors. Only 1 patient presented with nodal metastasis. There was no intracranial tumor extension, perineural tumor spread along the infraorbital nerve, distant metastasis, or dacryocystocele formation in any of the patients at the time of diagnosis.SCCAsquamous cell carcinoma