title: Testing of lacrimal drainage with the aid of a gamma-ray emitting radiopharmaceutical (99m TcO4).
mesh_terms: D006801:Humans; D007767:Lacrimal Duct Obstruction / Q000175:diagnosis*; D008722:Methods; D011877:Radionuclide Imaging; D013667:Technetium
chemical_list: D013667:Technetium