Fig. 16From: Sesamoids and accessory ossicles of the foot: anatomical variability and related pathologyDegeneration at a synchondrosis. a Long-axis axial CT image shows increased sclerosis (black arrow) and subchondral cyst formation in an os trigonum. b Sagittal CT image reveals subchondral cyst formation in the talus (black arrow) and os trigonum (white arrow) across the synchondrosis, due to degenerative changeBack to article page