An<unk>  is an area of skin and underlying tissues vascularized by a source artery. It is a concept that is used by plastic surgeons for the creation of perforator flaps and by interventional radiologists for the endovascular treatment of critical limb ischemia.
Angiosome
Granulation tissue
Enema
Calculus 
Neoplasm
Blood blister
Papule
Muscle tissue