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Thank you for the question. Answers given are for informational purposes only and are not meant to replace an exam by an in-person.
I am Dr. Sohaib, a Medical Internist (who deals with diseases of all the organ systems of body) and I will do my best to help you today.
Some degree of difference in blood pressure noted from both arms is normal. There have been many studies conducted to determine how much difference in the readings should be considered normal or abnormal.
In general, if the blood pressure measurements vary more than 10mmHg (or simply 10 points) then definitely this is NOT NORMAL.
This can be due to the cyst.
But there are other causes as well such as peripheral arterial disease, vasculitis, cholesterol build up in the arteries etc.
You should have this reported to your doctor, and have a comprehensive clinical examination done. This must include BP check up in both arms by the doctor not only at wrists, but also at elbows.
If deemed necessary he can proceed with further tests like Doppler Scan of the arteries to determine any problem in them.
I hope this clarifies and answers your question.
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