title: Scintigraphic studies of uterine and placental growth and placental migration during pregnancy.
abstract: Placental scintigraphy with 113mIn (Indium) combined with cervical marking with a shielded 57Co (Cobalt) radioactive source was used to study uterine and placental growth in human pregnancy and placental location and migration in a total of 176 patients. Uterine length measurements can be used for selecting growth retarded fetuses. There was an approximately constant ratio between placenta diameter and uterine length (0.68 +/- 0.03). When the placenta was located on the ventral uterine wall, low implantation occurred in 61%. The corresponding figure for low implantation when the placenta was located on the dorsal uterine wall was 30%. The difference was highly significant. Placental migration was studied in 20 patients. Significant migration occurred in 11 cases. The placental margin closest to the internal cervical os migrated outwards about 3 cm on average.
mesh_terms: D005260:Female; D006801:Humans; D007204:Indium; D010920:Placenta / Q000000981:diagnostic imaging / Q000502:physiology*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000000981:diagnostic imaging*; D011262:Pregnancy Trimester, Second; D011263:Pregnancy Trimester, Third; D011868:Radioisotopes; D011877:Radionuclide Imaging; D014599:Uterus / Q000000981:diagnostic imaging / Q000502:physiology*
chemical_list: D011868:Radioisotopes; D007204:Indium