Olivieri I et al. - All dactylitic toes showed mild-to-moderate fluid collection in the synovial sheaths of flexor digitorum brevis and longus. Involvement of joint cavity was simultaneously seen in at least one joint of eight (66.6%) out of the 12 toes. A mild-to-severe peritendinous soft tissue edema was observed in all but one of the affected toes. In no dactylitic toe was bone edema observed either near the insertions of the flexor digitorum brevis and longus tendons or in other sites of the phalanges. No lesions were observed in the 12 contralateral clinically normal toes. In SpA toe dactylitis there is no evidence of enthesitis of the flexor digitorum brevis and longus tendons and joint capsules.
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