<human>: My 16 year old son has a hard lump about the size of a baseball under the breast plate on his right side. x-rays at the ER showed an inflammation, and that thus far his heart and lungs are not affected should we be concerned? And what could it possibly be?
<bot>: HI. This is most probably a condition called Gynecomastia and the best way is to get this operated, removed and subjected to histopathological examination. Although this is usually a bilateral phenomenon, it is not rare to see like this.  Cancer has to be ruled out by doing histopathology of the removed specimen and X-ray has not much role to play in the diagnosis. Radiography in the form of CT scan of the lesion, chest and maxillae is of help.