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A 66-year-old man with a history of two L4–L5 minimally invasive tubular approaches for microdiscectomy and an L5–S1 anterior lumbar interbody fusion returned to the clinic after 1 year for thoracic and left flank pain. The pain began a few weeks before presentation. Pain was described as sharp and stretching across his mid-back without radiation to the front. CT scan of the abdomen revealed a calcified lesion contiguous with the disc space protruding into the epidural space at T10–T11 (figure 1). MRI scan of the thoracic spine eliminated suspicion for an epidural abscess and haematoma (figure 2). Interestingly, a plain radiograph from 2 years prior demonstrated calcifications within the T10–11 disc space.
The patient denied systemic signs of illness, and laboratory markers for infection were low. The patient also denied any recent injections, new neurological deficits, myelopathic symptoms or trauma. He had no risk factors for calcified discs (ie, metabolic disorders), osteodiscitis or epidural haematoma. The patient failed conservative pain management with medication alone (ibuprofen, gabapentin and methylprednisolone dose pack) at a 6-week follow-up. The patient subsequently received a thoracic epidural steroid injection (ESI) that led to symptom resolution. On 6-month follow-up, the patient was symptom free, and a CT scan revealed radiographic resolution of the epidural calcification (figure 3).
This case most likely represents a calcified disc herniation with spontaneous resolution. Disc reabsorption is likely to be the natural history of this entity, with the ESI providing symptomatic relief while healing is occurring.1 2
Calcified disc herniations may resolve spontaneously with conservative management.
The differential diagnosis for a ventral epidural mass should include disc herniation, epidural haematoma, osteodiscitis with abscess, and benign intra-axial neoplasm (ie, meningioma, schwannoma).
Contributors LS and DPA were involved in drafting of the case report. DJW and RG were involved in editing of the case report.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
Patient consent for publication Obtained.
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