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Poorly Cohesive (Signet Ring Cell) Carcinoma of the Ampulla of VaterTuncel, Deniz; Basturk, Olca; Bradley, Kyle T.; Kim, Grace E.; Xue, Yue; Reid, Michelle D.; Balci, Serdar; Erbarut, Ipek; Adsay, Volkan · International Journal of Surgical Pathology · 2019