Pressure ulceration grade 4

**Definition:** Pressure ulcer with visible or directly palpable muscle, tendon or bone as a result of full thickness loss of skin and subcutaneous tissue. Slough or eschar may be present. The depth varies by anatomical location: grade IV pressure ulcers can be shallow in areas with little or no subcutaneous fat (e.g. bridge of the nose, ear, occiput and malleolus) but are typically deep and often undermine or tunnel into adjacent structures.

**Inclusions:** - pressure injury stage 4 with full thickness tissue loss