Nuclear dacryocystography

Nuclear dacryocystography (DCG) correlates well with conventional contrast DCG. The former is perhaps superior to the latter, because of its several advantages: no trauma to the patient since no catheterization of the duct is executed; low radiation dose to the lens (4 to 6 mrad); and better diagnosis of functional and anatomic block. Nuclear DCG seems to be a reliable and accurate routine screening procedure, for evaluating suspected lacrimal block.