Gynaecomastia as a presenting feature of thyrotoxicosis

The association between gynaecomastia and thyrotoxicosis is well recognised . However, the reported frequency of the association is variable, partly de pending upon the defining criteria used. Here we report two patients with t hyrotoxicosis in whom gynaecomastia was the presenting feature. Both patien ts had other contributing factors, which are assumed to have predisposed to gynaecomastia. In both patients, the gynaecomastia resolved with successfu l treatment of the thyrotoxicosis. When gynaecomastia is a presenting, or p rominent feature of thyrotoxicosis, the possibility of additional underlyin g pathology should be considered.