I wouldn’t say it’s serious. It is a bone cyst—a fluid filled space. Since this is usually caused by dilatation and bursting of a blood vessel, it is called an aneurysmal bone cyst. If this happened in skull bone or spine, then this can become serious. The cavity of larger cyst is usually filled with bone chips or cementing substances. For smaller cysts, only a curettage or removal of cyst is done. I believe your symptoms should improve now. Do discuss this with your doctor. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.
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