I am sorry to hear about your son. The only way you would have a potential case would be if the failure to diagnosis the cyst at the first appointment caused additional damage to your son. Meaning, if they had found it on the first visit, they would have been able to treat it less aggressively or without surgery. If the cyst was going to have to be removed one way or the other, you likely have no case. However, if you would like, you can request your medical records from the first visit and the emergency surgery and try and locate an attorney in your area to review the records. Most consultations are free. Best of luck.
NOTE: This response is general in nature and should not be considered legal advice. No attorney-client relationship exists or is formed by this response.
Answered on Feb 25th, 2014 at 4:06 PM