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Pathology. Core omental mass biopsy. (A) Clusters of carcinoma cells with prominent nucleoli and cytoplasmic vacuolisation. H&E stain, ×400. (B) The tumour cells are immunoreactive for thyroid transcription factor immunostain, ×400. (C) Programmed death ligand 1 (PD-L1) immunostain positivity in tumour cells, ×400.
