Penumbra

Rarity: Common

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What Wikipedia says

In pathology and anatomy the penumbra is the area surrounding an ischemic event such as thrombotic or embolic stroke. Immediately following the event, blood flow and therefore oxygen transport is reduced locally, leading to hypoxia of the cells near the location of the original insult.

Excerpt from the Wikipedia article “Penumbra (medicine)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Kinchip, CC BY-SA 3.0, via Wikimedia Commons.