Breakage and retention of thoracic paravertebral catheter -
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Paravertebral catheters are generally inserted and removed without complications. However, catheter breakage occurs rarely. This is the first report describing breakage of a thoracic paravertebral catheter and retention of the catheter fragment within the patient.

Case presentation:
A 65-year-old female patient complained of an unusual sensation in her back during postoperative chemotherapy for lung cancer. A catheter fragment was identified in the soft tissues of the back on computed tomography. The paravertebral catheter had been placed 2 years prior left lower lobectomy. The patient had neither neurological symptoms nor infection signs around the fragment. However, the potential side effects of chemotherapy, including coagulopathy and immunosuppression, increased the risk of late-onset hematoma and abscess formation around the fragment. Catheter fragment was surgically removed. Analysis of the fragment revealed that the catheter had been severed by the cutting edge of the Tuohy needle or the suture needle...

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