APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -A sequestrum represents a segment of necrotic bone that is separated from living bone by granulation tissue. An involucrum denotes a layer of living bone that has formed about dead bone; it can become perforated by tracts. An opening in the involucrum is termed cloaca.

Detailed explanation-2: -A sequestrum is a segment of necrotic bone that becomes separated or “sequestered” from the healthy intact bone. The reactive bone that forms around the necrotic sequestrum is referred to as the involucrum and the draining tract extending from the skin to the sequestrum is termed the cloaca.

Detailed explanation-3: -Chronic osteomyelitis A fragment of dead infected bone becomes separated from viable bone and is known as a sequestrum.