(A) Calcification of the common extensor tendon enthesis (arrow) (P8, 25 years 6 months). (B) Fusion of the C2-C3 and C4-C5 posterior vertebral bodies, articular processes, and laminae (arrows) (P8, 25 years 6 months). (C) Mild calcification of the interosseous membrane of the leg (arrow) (P11, 25 years 3 months). (D) Calcification of the Achilles tendon enthesis (arrow) and enthesophyte in the plantar fascia (arrowhead) (P11, 25 years 3 months).