CASE
A 33-year-old male presented with a 2-year history of left ankle pain. He reported experiencing a feeling that his ankle needed to "pop" prior to the onset of the pain. He said that while attempting to "pop" his ankle, he felt a sudden cracking sensation followed by severe posterolateral pain. Two days later, swelling developed in the same area. The patient denied any other trauma to the foot and was not participating in any repetitive, high-impact weight-bearing activity, such as jogging. After taking anti-inflammatory medication for 2 days without improvement, he presented to his local physician's office. MRI of the foot revealed a lesion that was interpreted as a stress fracture of the calcaneus (Figure 1). A cast was placed and the patient was instructed to avoid weight-bearing activity and transitioned to a fracture boot over 6 weeks. However, his pain and swelling continued. The patient subsequently sought medical attention with several other doctors for persistent pain and swelling of the ankle. No further imaging was obtained. The patient gave up seeing any providers after 12 months and tried to live with the pain for another year. Two years after his initial presentation, he presented again for an evaluation that included radiography and MRI of his ankle. The images are shown in Figure 2 and Figure 3, respectively. What do the images reveal?
