Ossification of the plantar fascia and peroneus longus tendons in diffuse idiopathic skeletal hyperostosis (DISH)

Extraspinal skeletal changes in diffuse idiopathic skeletal hyperostosis (DISH) consist of bony proliferation at ligamentous and tendinous insertions. We describe a patient with DISH who manifested ossific changes in the plantar fascia and peroneus longus tendon bilaterally at sites not immediately adjacent to the bony insertions of these structures. This observation expands the roentgenographic spectrum of DISH.