Patient was sent to my office to complete RCT #47 (31) with apical periodontitis after pulp necrosis. Mesial canals were calcified and both ledged. RD broke the file trying to negotiate the canal. I had to spend much more time trying to find the apical portion of both mesials than retrieving the fragment.
The patient is 45 y.o. male. It is probably a dentigerous (follicular) cyst.