Chronic inflammation (as can be caused by any number of things) is usually jumped on by the body's defenses -- white blood cells et al. If these guys are unable to protect the host from tissue damage, the body tries to wall off and isolate the infected site, forming a granuloma.
Tuberculosis is one particular disease that is pretty famous for causing granulomas in the lung. Other infections can do it too, like the one that caused your pneumonia.
Granulomas can and will often shrink once the inflammatory process is gone, but the walled-off structure might stick around for life.
If it's causing you chest pain, after your hospital discharge, a good idea would be to go back to the doctor.
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