title: Letter: False-positive cytology in ectopic pregnancy.
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000175:diagnosis*; D014594:Uterine Neoplasms / Q000175:diagnosis*; D014626:Vaginal Smears