You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Indications of FESS -a) Inverted papilloma b) Nasal Allergic polyposisc) Mucoceled) Ca maxilla and explain in detail?
Indications of FESS 

Chronic bacterial sinusitis unresponsive to adequate medical treatment.
Recurrent acute bacterial sinusitis.
Polypoid rhinosinusitis (diffuse nasal polyposis).
Fungal sinusitis with fungal ball or nasal polypi.
Antrochoanal polyp and Ethmoid polyp
Mucocele of frontoethmoid or sphenoid sinus.
Control of epistaxis by endoscopic cautery.
Removal of foreign body from the nose or sinus.
Endoscopic septoplasty.
Removal of benign tumours, e.g. inverted papillomas or angiofibromas.
Orbital abscess or cellulitis management.
Dacryocystorhinostomy.
Repair of CSF leak.
Pituitary surgery
Optic nerve decompression.
Orbital decompression for Graves disease.
Control of posterior epistaxis (endoscopic clipping of sphenopalatine artery).
Choanal atresia.