Lytic bone metastasis
Bone metastases. The majority of bone metastases are lytic (the only two exceptions that you need to know about are breast and prostate). The large destructive lesion replacing the left pubic bone in this case (arrows) was a metastasis from lung cancer. You should note, however, that radiographs are a relatively insensitive way of identifying bone metastases; CT, MRI, bone scan and PET are much better.