Primary malignant tumors of the lacrimal passage, particularly of the nasolacrimal duct, are rare. We describe a 72-year-old woman who presented with lacrimation 5 years previously. She had pain and bloody and purulent lacrimation, and a mass was identified in the inferior meatus. Accordingly, she was diagnosed with primary adenoid cystic carcinoma of the nasolacrimal duct. She was treated with proton beam therapy and showed a favorable response. Owing to the long-term risks of recurrence and distant metastasis, adenoid cystic carcinoma requires sufficient follow-up.
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