Cuboid oedema due to peroneus longus tendinopathy: a report of four cases
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To highlight focal bone abnormality in the cuboid due to tendinopathy of the adjacent peroneus longus.
A retrospective review was carried out of the relevant clinical and imaging features.
Two male and two female patients were studied, mean age 51.5 years (range 32―67 years), referred with foot pain and imaging showing an abnormal cuboid thought to represent either tumour or infection.
A long history of foot pain was usual with a maximum of 8 years. Radiographs were normal in two cases and showed erosion in two, one of which exhibited periosteal new bone formation affecting the cuboid. Bone scintigraphy was undertaken in two patients, both of whom showed increased uptake of isotope. MRI, performed in all patients, showed oedema in the cuboid adjacent to the peroneus longus tendon. The tendon and/or paratendinous tissues were abnormal in all cases, but no tendon discontinuity was identified. One patient possessed an os peroneum. Unequivocal evidence of bone erosion was seen using MRI in three patients, but with greater clarity in two cases using CT. Additional findings of tenosynovitis of tibialis posterior, oedema in the adjacent medial malleolus and synovitis of multiple joints in the foot were seen in one patient. Imaging diagnosis was made in all cases avoiding bone biopsy, but surgical exploration of the peroneal tendons was performed in two cases and biopsy of ankle synovium in one.
Oedema with erosion of the cuboid bone, simulating a bone lesion (cuboid “pseudotumour”), may be caused by adjacent tendinopathy of peroneus longus. It is vital to be aware of this entity to avoid unnecessary biopsy of the cuboid.
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- Cuboid oedema due to peroneus longus tendinopathy: a report of four cases
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