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2. Congenital cystic tumor of neurenteric canal;Hansmann;Surg., Gynec. & Obst.,1926
3. Ventral tumors of the sacrum;Hundling;Surg., Gynec. & Obst.,1924
4. Sacrococcygeal tumors;Hansmann;Arch. Surg.,1932
5. Sacrococcygeal tumors;Keen;Surg., Gynec. & Obst.,1906