A bone lesion in the foot that is expanding, causing progressive pain, and thinning the surrounding cortex is…

A bone lesion in the foot that is expanding, causing progressive pain, and thinning the surrounding cortex is a finding that requires expert evaluation — and an aneurysmal bone cyst is one diagnosis that should never be left to chance. An aneurysmal bone cyst — ABC — is a benign but locally aggressive bone lesion characterized by blood-filled spaces separated by thin fibrous septa and reactive bone. Despite being classified as benig