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. O'Donnell P et al reported Cuboid oedema due to peroneus longus tendinopathy in acase series of 4 cases. The tendon and/or paratendinous tissues were abnormal in all cases, but no tendon discontinuity was identified. This highlights focal bone abnormality in the cuboid due to tendinopathy of the adjacent peroneus longus.