<prompt> Thorn wait cyst -Laryngeal cystNasopharyngeal cystEar cystNone  <response>: Ans. is b i.e., Nasopharyngeal cyst Thornwaldt cvst nasopharyngeal cysto A thornwaldt cyst is a benign midline nasopharyngeal mucosal cyst.o It is a developmental anomaly Which is usually asymptomatic and is found incidentally on imaging of nasopharynx. This is a notochord remnant.o Sometimes cyst may become infected and can cause halitosis or foul tasting periodic discharge into the mouth.o Asymptomatic lesions require no treatment. If treatment is required then de-roofing the cyst marsupialization is usually sufficient, and can be performed via a transpalatal approach.Also knowo Thornwaldts disease is infection of pharyngeal bursa, i.e. pharyngeal bursitis 