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Category 3: FNA cytology smears (case no. 1) showing scattered RS-like cells with prominent nucleoli (a and b; MGG, 200X), whereas on histology, excisional biopsy shows sheets of atypical lymphoid cells (c; H and E, 100X) which are diffusely positive for anti-CD20 antibody on immunostaining (d; CD20, 200X)
