This document discusses several medical cases and questions:
1) A patient presented with hearing loss in the left ear with a pars flaccida perforation. The recommended management is tympanoplasty.
2) The commonest complication of sinusitis is orbital infection.
3) A patient with Plummer-Vinson disease showing progressive dysphagia could indicate malignant changes, development of pharyngeal stenosis, or worsening iron deficiency anemia.
4) The commonest cause of oroantral fistula is extraction of the second premolar tooth.