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P. Pinto-Marques, J. Damião-Ferreira, E. Mendonça, A. Gaspar, M. Mafra, F. Mateus. "Unusual cause of CA 19.9 elevation diagnosed by endoscopic ultrasound-guided fine needle aspiration: a retrorectal tailgut cyst." Endoscopy 44.S 02 (2012) E248-E249