title: Fluid in the female pelvis: cyclic patterns.
abstract: A total of 254 pelvic sonograms were performed on 40 volunteers in order to determine a cyclic pattern, if any, of free fluid in the pelvis in asymptomatic premenopausal women. Free fluid was observed during all phases of the menstrual cycle. The highest percentage of positive-for-fluid sonograms was observed within 5 days preceding onset of menses in both oral contraceptive users and non-oral contraceptive users. The second highest percentage was observed between days 13 and 21 in non-oral contraceptive users.
mesh_terms: D000293:Adolescent; D000328:Adult; D003276:Contraceptives, Oral / Q000008:administration & dosage; D003937:Diagnosis, Differential; D005110:Extracellular Space / Q000378:metabolism*; D005260:Female; D005831:Genital Diseases, Female / Q000473:pathology*; D006801:Humans; D008597:Menstrual Cycle; D010053:Ovary / Q000473:pathology; D010060:Ovulation / Q000187:drug effects; D010388:Pelvis / Q000473:pathology*; D014463:Ultrasonography; D014599:Uterus / Q000473:pathology
chemical_list: D003276:Contraceptives, Oral