Reason: assess left foot dorsal first toe mass History: pain/swelling A marker was placed along the dorsal aspect of the skin surface dorsal to the first metatarsal head. There is a moderate hallux valgus deformity with mild to moderate osteoarthritis of the first MTP joint. There is enhancement of the first MTP joint indicating a synovitis with a synovial recess extending dorsomedially along the head of the first metatarsal, perhaps representing the palpable mass. This presumed synovial recess shows peripheral rim enhancement, but its contents are of low signal intensity on all sequences which may reflect debris rather than fluid, but we see no blooming artifact on gradient echo sequences to suggest pigmented villonodular synovitis. There are small erosions along the inferior margin of the first metatarsal head as well as mild subchondral edema within the first metatarsal head. Note is made of a bipartite medial sesamoid bone. The signal intensity of the phalanges of the great toe appears normal. The remaining visualized bones and soft tissues are unremarkable.
Hallux valgus deformity with osteoarthritis and synovitis of the first MTP joint.