CTICasesCostochondral Junction Ganglion Cyst
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Imaging findings
Chest radiographs and CT scans show a progressive, low-attenuation, cystic lesion arising from the first anterior costochondral junction. On radiographs, the lesion projects over the upper lung zone and mimics a pulmonary nodule, showing an incomplete border sign along its superior margin. On CT, the lesion is shown to project into the thoracic cavity from the chest wall joint without associated osteomyelitis or rib destruction.
Key takeaways
Ganglion cysts or benign cystic lesions can arise from the costochondral joint and mimic a pulmonary nodule on a chest radiograph due to the incomplete border sign. Surgical resection may be performed to rule out infection or malignancy, particularly in patients presenting with sepsis, though histologic analysis typically reveals only a benign, non-infected fluid-filled cyst.
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