Female, 11 years old. Bilateral foot pain RIGHT FOOT: The medial hallux sesamoid has low signal on T1 and PD sequences and increased bone marrow signal on STIR sequences suggesting marrow edema. The sesamoid bone maintains its morphology, without surrounding signal abnormality in the soft tissues. Bone marrow signal elsewhere is normal. No joint effusion, soft tissue edema, or discrete fluid collection.LEFT FOOT: The medial hallux sesamoid is bipartite. The hallux sesamoids, medial greater than lateral, have low signal on T1 and PD sequences, with slightly increased bone marrow signal on STIR sequences. No surrounding signal abnormality in the soft tissues. Bone marrow signal elsewhere is normal. No joint effusion, soft tissue edema, or discrete fluid collection.
Bone marrow edema involving the right medial hallux sesamoid and left hallux sesamoids without surrounding soft tissue edema, compatible with chronic sesamoiditis.