What complications can come from an arterior cervical discectomy surgery?

Many: The most common is difficulty swallowing. Other complications include infection, pain, nerve/spinal cord injury(rare), headache, and vocal cord paralysis amongst others.

Several : Failure to relieve pain or neurologic symptoms or findings, infection, hematoma, spinal fluid leakage, injury to other neck structures like blood vessels - esophagus-trachea, swelling, hoarseness , horner's syndrome, incomplete decompression, fusion or hardware failure if used, thoracic duct injury, stroke, heart attack, anesthesia issues & nerve or cord injury to name several.