Sesamoid ossicles of the nuchal ligament
Sesamoid ossicles of the nuchal ligament are a relatively common anatomical variant that are usually asymptomatic and most commonly occur at the C5/6 or C6/7 vertebral levels.
They occur in ~7.5% of the population, with a male predominance of 3:1 .
- well-defined, corticated, round or oval opacity on lateral projection
- cortical bone with central marrow within the nuchal ligament