I'm having open biopsy of neck lymph node diagnosed with atypical by previous needle biopsy. is cancer likely to be found?

Not necessarily: More history would be helpful such as is there a past history of cancer anywhere or a current mass in your thyroid or any other part of your body? "Atypical" findings on a fine needle biopsy can be secondary to inflammation and not malignancy. However, excisional biopsy of the node is critical to rule out malignancy. Good luck!