I have a lump on my chest, little lower than my collar bone. 
 

it feels boney, I've had a chest X-ray, blood tests and an ultrasound which all came back clear. Is one of those likely to pick up a tumor? As the lump/mass is protruding from my chest. 
 

the consultant did say my GP should have referred me for a CT scan but to attend my GP if I had any pain. Now sometimes there is a full ache but I'm not sure if it's just my imagination. 
 

can someone please put my mind at ease.