<s>[INST] Hi, iam a 36yr old female.my concern is when ever i bend over or lean forward i feel a lump rise up into my chest it gets stuck at top ov my ribcage.then it takes my breath away, i sit up straight then i see pop back down.what is it and should i be concerned.Thank you. [/INST] Hi. Thanks for your query. This is a bit atypical and rare presentation of any problem heard so far. Read you are female patient of 36 years - feel a lump rise up into the chest which gets stuck at the top of the rib-cage, on bending down and takes your breath away. It pops back when you sit straight. The possible cause is that this is a rare sort of tumor which has gone through the rib-cage and hence can see it grow or come back to original position. This can also be a broken segment of the rib from the previous accident. This can be diagnosed well with :Clinical actual physical examination by a Surgeon as proper history and examination alone can help the best, to be supplemented by CT scan of the chest and other relevant investigations. If required a surgery may be needed. </s>