An osteoid osteoma is a common, benign bone lesion that is prototypically painful at night with pain relieved by NSAIDs. Imaging will reveal a cortical nidus with surrounding bone marrow and periosteal changes. The nidus may or may not have a small area of central sclerosis. 

NSAIDs are considered first-line treatment, but there are numerous risks associated with prolonged use. Due to this, radiofrequency ablation is often the treatment of choice. Though RFA is highly effective, more than one ablation may be necessary due to a small risk of recurrence.

In this case, follow-up imaging was attained due to concern for bone stress injuries. This allowed excellent visualisation of the expected post-RFA changes. The central nidus was absent and there is circumferential sclerosis at the ablation site representing successful treatment.