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Tadpole Sign in Filum Terminale Paragangliomas
Sundarakrishnan Dharanipathy1, Hitesh Gurjar1, Amandeep Kumar1
1Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, India.
World Neurosurgery
|April 7, 2023
Summary
The "tadpole sign" on MRI helps diagnose spinal paraganglioma, a rare tumor. This imaging finding aids in identifying these tumors before surgery.
Area of Science:
- Radiology
- Oncology
- Neurosurgery
Background:
- Spinal tumors can present with low back pain.
- Intradural extramedullary lesions require accurate preoperative diagnosis.
- Spinal paragangliomas are rare neuroendocrine tumors.
Purpose of the Study:
- To describe the
- tadpole sign
- observed in spinal paraganglioma on contrast-enhanced MRI.
- To highlight the diagnostic utility of this sign in preoperative assessment.
Main Methods:
- Case report of two patients with low back pain.
- Contrast-enhanced magnetic resonance imaging (MRI) of the lumbosacral spine.
- Radiologic-pathologic correlation.
Main Results:
- MRI revealed enhancing intradural extramedullary lesions at L4-L5 and L2-L3 vertebral levels.
- The lesions exhibited a characteristic
- tadpole sign
- morphology.
- Histopathologic confirmation of spinal paraganglioma.
Conclusions:
- The
- tadpole sign
- is a distinctive radiologic feature of spinal paraganglioma.
- This sign is a valuable aid for preoperative diagnosis and surgical planning.
- Early identification of spinal paraganglioma improves patient outcomes.
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