Left olecranon is the part in left forearm that projects behind the elbow and extends from the forearm to the elbow. In order words, the olecranon forms the bony prominence of the elbow.
The "dorsum" essentially means the posterior side. So, here we are treating an swelling that occurs at the posterior side of the bony prominence of the elbow.
The sentence can be interpreted as a "patient has swelling & pain at the left elbow and the pain extends from the elbow to upper surface".
In conclusion, such swelling can be treated with physiotherapy exercise or surgery, depending on what is seen on digital X-ray as regard the site of pain.
Learn about olecranon process here
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