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Ill defined consolidation in the lung with possible cavitation suggests that there is an infection in the right lower lung -- likely related to your pneumonia.
Cavitation happens when there is air and fluid in a circular area on the xray, and suggestive of a possible abscess in the lung -- from the pneumonia.
There are other reasons for cavitation, like blood clots, tumors, granulomas from rheumatologic diseases -- but given your pneumonia, this may mean a serious infection in the lung.
Certainly if you continue to feel unwell (continued fevers, etc), it would be best to get re-evaluated and repeat the chest xray.
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This is so your doctor doesn't miss this finding -- as if you aren't getting better -- noting that you have a possible abscess in the lung would warrant further evaluation and treatment.
Cancer is a remote possibility -- but given that this is in the area of your lung infection -- and that you just had pneumonia -- this all points to pneumonia here.
You're welcome, best of luck.