[Early and minimal manifestations of hyperparathyroidism bordering the distal tuberosity of the fingers].

Early and minimal changes of hyperparathyroidism often occur only at the margin of the ungual tufts in various kinds scarcely noticed upto now. Hence, the cortical line may be locally resorbed only at the outer or inner side within this line without interruption, or the cortical line of a normal or nearly normal breadth may be shortly interrupted. The recognition of a resorptive event is more difficult if at the same speed of exomarginal resorption, an endomarginal formation of bone occurs; the cortical line then seems to be like normal but has changed its former course. Sometimes the cortical line has completely disappeared and below it a sclerotic zone has developed. Resorptions at the proximal processes are the most frequent ones; they occur both as an isolated reaction or combined with the above mentioned minor changes at the cortical line of the remaining ungual tuft.