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Updated: Jun 17, 2026
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Intraoperative Ultrasound in Spinal Surgery
Published on: August 17, 2022
An unusual primitive neuroectodermal tumor in the thoracic epidural space
Sio-Iong Chang1, Ming-Cheng Tsai, Ming-Dar Tsai
1Department of Neurosurgery, Cardinal Tien Hospital, Yonghe City, Taipei County, Taiwan.
Summary
Primitive neuroectodermal tumors (PNETs) are rare spinal neoplasms. This case highlights a primary epidural PNET in a young patient, with surgery alone leading to no local recurrence but mediastinal enlargement.
Area of Science:
- Neuro-oncology
- Spinal Neoplasms
Background:
- Primitive neuroectodermal tumors (PNETs) encompass various central nervous system neoplasms.
- Primary epidural PNETs are exceptionally rare, with limited reported cases.
- Spinal PNETs generally carry a poor prognosis, and optimal treatment remains undefined.
Observation:
- A 15-year-old female presented with progressive upper back pain and lower leg weakness.
- Thoracic spine MRI revealed a dumbbell-shaped epidural mass (T2-4) with paraspinal and mediastinal extension.
- Pathological examination confirmed the mass as a PNET.
Findings:
- The patient underwent surgical resection for tumor decompression.
- One year post-surgery, no local recurrence was observed in the epidural space.
- However, the mediastinal component of the tumor demonstrated enlargement.
Implications:
- Primary epidural PNETs, potentially a subtype of spinal PNETs, present unique therapeutic challenges.
- The efficacy of surgery alone versus combined modality treatment (surgery with radiotherapy/chemotherapy) is debated.
- This case underscores the need for further research into optimal management strategies for primary epidural PNETs.
