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Validation of the Domain-KEY algorithm for identifying PNI in oropharyngeal and hypopharyngeal malignancies. (A) Identification of PNI in oropharyngeal carcinoma (green box). The arrowhead indicates the tumor surrounding the entire nerve (B). Identification of PNI in hypopharyngeal carcinoma (green boxes). The arrowhead indicates the tumor that focally touched the perineurium.
