Located around the anus, the opening of the rectum to the outside of the body.
- Perianal abscess
A local accumulation of pus that forms next to the anus, causing tender swelling in that area and pain on defecation.
Around the aorta. For example, periaortic lymph nodes are lymph nodes around the aorta.
Near the appendix. Perforation of the appendix can lead to a periappendiceal abscess (a collection of pus near the appendix).
Referring to the pericardium, the sac of fibrous tissue that surrounds the heart.
- Pericardial effusion
Too much fluid within the pericardium, which normally contains a small amount of serous, pale yellow fluid.