A 7 yo boy is brought to GP by mother due t mass on side of neck. Physical exam shows a small, mobile cyst along anterior border of the sternocleidomastoid muscle. 1. What is your diagnosis? 2. What is cause?

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1. A 7 yo boy is brought to GP by mother due t mass on side of neck. Physical exam shows a small, mobile cyst along anterior border of the sternocleidomastoid muscle. 1. What is your diagnosis? 2. What is cause?