<prompt> Modified Youngs operation is done for:Atrophic rhinitisAllergic rhinitisAcute sinusitisChronic sinusitis  <response>: Ans: A Atrophic rhinitis Ref: Diseases of the Ear Nose and Throat by PL Dhingra. 5th edn. 2010 page 170Explantation:Youngs OperationIt is done as a treatment of atrophic rhinitisIt involves closure of the nasal cavity affected with atrophic rhinitis by creating mucocutaneous flaps.These flaps are sutured together in two layers: first the mucosal layer, then the skin layer.The nasal cavity is kept closed for a period of 9 months.Re-examination is done after 9 months - if the crusts have disappeared, a revision surgery is performed and the nasal cavity is reopened.The theory behind this procedure is that the closed nasal cavity has time to heal. 