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A 40-year-old man who goes horseback riding 3 to 4 ...

Myositis ossificans

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submitted by bunye(5),

Mesenchymal tissue can also undergo metaplasia.

A classic example is myositis ossificansmin which connective tissue within muscle changes to bone during healing after trauma - Pathoma Ch 1 pg 2

bunye  ossificans in which* +  
famylife  Images: https://www.google.com/search?q=myositis+ossificans&rlz=1C1CHZL_enUS753US753&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjytonS0dfiAhWMVN8KHaE2CUUQ_AUIECgB&biw=1368&bih=809#imgrc=tw9b-AqKfJOb7M: +  




https://www.medicalnewstoday.com/articles/320718.php

"Myositis ossificans usually occurs where a person has experienced a single traumatic injury, such as sustaining a hit while playing football or soccer that causes a deep muscle bruise.

It can also happen when there is a repetitive injury to the same area, such as in the thighs of horseback riders. Very rarely, myositis ossificans can occur after a severe muscle strain."