Could you explain what slight thickening in ethmoid sinuses is is it serious should I have my ENT dr look at it I had surgery for deviated septum?

Check with ENT. The thickening in the ethmoids is likely not serious but indicates inflammation if the lining of the ethmoid sinus (the sinuses between your eyes). This may present with symptoms of congestion and facial pressure or headache. Better off seeing your ENT to further evaluate and treat symptoms you may have.