Female, 45 years old. Pain. F/u bone edema second metatarsal. There is bone marrow edema diffusely involving the navicular on STIR images, with slightly decreased T1 signal particularly along the anterior aspect of the bone, but no discrete fracture line is identified. The remainder of the bones of the ankle and midfoot show normal marrow signal. There is no specific abnormality in the region of the marker which is placed along the medial aspect of the first metatarsal head.There is mild nonspecific edema in the region of the flexor muscles plantar to the first and second metatarsals extending toward the forefoot. Otherwise, the soft tissues including the sinus tarsi show normal signal. There is a small ankle joint effusion.
Abnormal bone marrow signal of the tarsal navicular without discrete fracture line identified. This is a nonspecific finding, which may reflect stress reaction/chronic injury or early avascular necrosis.