Hi, thanks for writing to HCM.
There is no hard and fast rule that chondrosarcoma should recur in the same area after excision.
The hard lump could be a metastatic lesion.
specimen of the lump is to be sent for histopathological examination to make a correct diagnosis. An MRI
scan is also needed to know the extent and nature of the swelling.
Hope this information is helpful. Good day