Background: Nasal dermoid sinus cyst (NDSC) is a rare congenital lesion, typically presenting at birth or in early infancy. Treatment of NDSC includes complete resection of the mass and the sinus tract, which may extend intracranially. Incomplete resection of the track is associated with high recurrence. We were looking for methods to delineate the NDSC track, without increasing the financial burden to the patient. Method:The patient was a 12-year-old female who came with a recent onset nasal swelling, which developed near a punctum present since birth. Intraoperatively, we cannulated the sinus and injected methylene blue (MB) dye through it. The dye served as a visual guide for the dissection.Result: Complete excision could be achieved. No complications or recurrence has been noted after more than a year. Conclusion:We advocate the use of MB for precise and complete excision of NDSC. The method needs to be explored in a larger series.