TYROBP and Nasu-Hakola disease: The bone and joint structures of the monoallelic TYROBP deletion carrier were otherwise unremarkable, except for two small cystic-appearing translucencies in the wrists (lunates) and slight ulnar minus variance (Fig. 3A), and cystic-appearing translucencies in the left calcaneus and the left distal tibia (Fig. 3B), bearing resemblance to the classical findings in NHD.