The incidence of strumiprivous tetany varies somewhat, but the records of the best clinics show an occurrence of about one case in every thousand thyroid operations. When encountered, such cases cause more or less concern as to the choice of treatment.
Since the introduction of active parathyroid extracts by Hanson, 1 Berman, 2 Collip 3 and others, 4 only two case reports of their application as a specific in the treatment of strumiprivous tetany have appeared in the literature. Snell5 reported one case which responded readily either to orally administered calcium lactate, in large doses, or to parenterally introduced parathyroid extract. (The doses given were in terms of cubic centimeters without mention of their unitage). Lisser and Shepardson6 also reported one case which responded well to parathyroid extract, parenterally administered in relatively small doses. The experience of these two groups of investigators would give the impression that the