What Does This X-ray Report Mean?

Hi! Doc., good day. I have a SINUS problem & my doctor said that there s no cure and I have to take my maintenance medicine everyday. Can I ask what is the meaning of my X-Ray result? [RETICULAR INFILTRATES ARE NOTED IN THE LEFT UPPER LOBE?,. ] IMPRESSION: LEFT UPPER LOBE PTB OF UNDETERMINED ACTIVITY?. Please answer my question doc, thank you very much & God Bless...