<prompt> Which of the following arises from pheryngeal bursa-Thornwalds diseaseCraniopharyngiomaChordomaLymphoma  <response>: Ans: A. Thornwalds diseaseRef: Scott-Browns otolaryngologlt Vhe vol-2 p. 161, 2122; Dhingra She p. 260Thornwalds disease Pharyngeal bursitis:Infection of the pharyngeal bursa which is a median recess representing attachment of notochord to endoderm of the primitive pharynx.Pharyngeal bursa is located in the midline of posterior wall of the nasopharynx in the adenoid mass.Asymptomatic lesions require no treatment.If treatment is required then de-roofing the cyst marsupialization is usually sufficient, and can be performed a transpalatal approach. 