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Robotic surgery is increasingly being performed for endometrial cancer. Robotic hysterectomies (RH), like traditional laparoscopic hysterectomies (LH), involve a significant amount of uterine manipulation. The use of a manipulator is thought to possibly increase the incidence of artifactual tumor displacement beyond the endometrium, including the fallopian tube. The objective of this study was to determine whether there is an association between RH and tumor present in the fallopian tube lumina. All RH and LH cases performed for endometrial cancer from May 2007 to August 2009 were reviewed. Of the cases not converted to laparotomy, 137 RH and 184 LH were identified. Age, body mass index, operative and hysterectomy time, type and grade of tumor, stage, pelvic wash results, and the presence of detached tumor fragments (contaminants) in the lumina of the fallopian tubes were recorded. Appropriate statistical tests were applied. Of the 184 LH, 4 (2.2%) were reported to have detached fragments of tumor in the lumina of the fallopian tubes compared with 16 of the 137 (11.7%) RH cases (P<0.001). The majority of the patients with RH and tumor present in the tubes had Stage I disease (9/16, 56.2%) and Grade 1 tumors (9/16, 56.2%). Four (4/16, 25%) patients had Stage IIIa disease detected by a pelvic wash. Patients with contaminants had a higher body mass index, but the difference was not statistically significant and was possibly due to small numbers. In conclusion, our data demonstrate an association between RH and tubal contamination. The clinical significance of this phenomenon remains to be determined.