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Thornwaldts cyst is a rare benign developmental lesion induced by persistent notocord remnants within the midline nasop-harynx. Although most patients with the cyst are symptom-free, inflamation or an absces can develop. Treatment involves rette, scissors, and so on. But recently by introduction of nasal endoscopy and its extended application, transnasal approach using nasal endoscopy becomes useful surgical approach to nasopharynx. We report a case of Thornwaldts cyst which was successfuly removed with nasal endoscopy in a 30-year-old man. (Korean J Otolaryngol 2002;45:722-4)