[Primary hyperparathyroidism. A retrospective study of 500 cases (author's transl)].

A retrospective study of more than 500 case-records of primary hyperparathyroidism was undertaken with the view of elucidating a number of problems raised in recent years: incidence of the disease, new clinical features, diagnostic methods and possible associations with other pathologies. The authors summarize the operative findings and the immediate or long-term results of surgical treatment, which on the whole are satisfactory and of long duration.

[Differentiation between parathyroid adenoma and hyperplasia. Proof by peroperative Wang floating test (author's transl)].

It is sometimes very difficult during operation to distinguish a normal parathyroid gland from a hyperplasic gland. The Wang test offers a solution, very simply demonstrating a difference in density between two glandular specimens. Normal parathyroid tissue, with its fat-containing cells, floats, in contrast to hypersecreting glands which are poor in lipid elements.