welcome in H.C.M.
By your query I came to know that even after tonsil operation you are having throat problem in the form of ulcers. At present your C.T.scan of paranasal sinuses
revailes Deviated nasal septum
, Rt maxillary and ethmoidal sinusitis
, Cyst in Rt maxillary sinus.
Your C.T.scan finding suggest abnormality which is responsible for recurrent infection in throat as culture report says for strep infection.
For getting permanent relief you should consult ENT doctor for septoplasty and Functional endoscopic sinus surgery
I think your query is answered.