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(a) CK7 showing strong positivity in the papillary areas and moderate-intensity positivity in the follicular areas; (b) Napsin-A is positive in the adenocarcinoma component indicating primary pulmonary origin while being negative in the follicular component; (c) and (d) pax-8 and thyroglobulin highlight the peripheral follicular tumour indicating thyroid origin while the central adenocarcinoma component is negative.
