Which option best describes a draining lesion that forms a tract from bone to skin?

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In chronic osteomyelitis, a cloaca is the drainage window through the bone (involucrum) that connects the infected interior to the skin. So a draining lesion that forms a tract from bone to skin is best described as a cloaca because it specifies the opening in the bone system that allows drainage to the surface. Sinus tract formation is a general draining channel to the skin, but the term cloaca denotes the particular bony opening for drainage. Marjolin ulcer is malignant change in a chronic wound, and involucrum formation is the new bone growth around dead bone, not a drainage tract.