Osteomyelitis is an infection of bone tissue. Can be serious, difficult to treat. Abscesses form and typically also isolated isles of dead bone. The latter are called sequestrae (singular sequestrum), and the process itself is - surprise, surprise - called sequestration. There are other meanings to the word, of course, but methinks some of you will find the allegory fitting.

Pibbur who knows that (of course) there is a heavy metal band called Sequester