Lump bet.the ribcage and xyphoid process?is.it dangerous?done mammogram and it was normal..

Depends: It is hard to say if this is dangerous without examining you. I recommend you contact your primary care physician for an examination. You may need a different type of radiographic exam like an ultrasound or a cat scan.

Lump: This probably wasn't included on the mammogram due to its location. Most of the time lumps in this area are due to anatomic variations of the bone/cartilage, but you should follow up with your physician because I can only speculate.