Hyperthyroidism Complicated by Periodic Paralysis.

and humeri. It is therefore difficult to account for the occasional involvement of bones such as the patella, clavicle and scapula. The small size of the patella and its dense cancellous structure make the bone an unlikely site for a metastatic deposit. Joll (1923) suggested that trauma may determine the establishment of a circulating tumour embolus. In this case, however, there was no previous history of injury.