The 16th Spring Seminar of the Korean Pathologists Association of North America: Critical Review and Appraisal of Recently Described Entities and Classifications.

Information on papers that critically review new entities on general surgical pathology that were presented at the 16th spring seminar of the Korean Pathologists Association of North America (KOPANA) in 2018 is presented. Topics include diffuse gliomas for nonneuropathologists, p16 immunohistochemistry (IHC) in melanocytic lesions, and the 2-tier grading system for laryngeal squamous precursor lesions. The seminar featured pathologists including Eunlee S. Yi, Eun Y. Lee, and Jae Y. Ro.