Opening from the soft tissue into a hollow visceral organ or beyond the epidermis is known as?

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A sinus tract is an abnormal channel that runs from an infection or inflammatory focus in soft tissue to the skin surface or into a hollow organ. This matches the description of an opening from soft tissue into a hollow visceral organ or beyond the epidermis, because the tract provides a path from deeper tissues to an external surface or to a luminal structure, often allowing drainage. This is distinct from other terms: involucrum formation refers to new bone growth around dead bone in osteomyelitis, Marjolin ulcer denotes malignant transformation of a chronic wound, and cloaca refers to a congenital single opening for multiple tracts rather than a generic tract from tissue to a surface or organ.