Endocrine tumors associated with the vagus nerve

Area of Science:

• Endocrinology
• Neurosurgery
• Genetics

Background:

• The vagus nerve (cranial nerve X) is central to the parasympathetic nervous system.
• Vagal paragangliomas (VPGLs) are rare neural crest tumors, a common site for hereditary head and neck paragangliomas (HNPGLs), often linked to SDHD gene mutations.
• Parathyroid tissue and adenomas can also occur in close proximity to the vagus nerve.

Purpose of the Study:

• To review the embryology, molecular genetics, and modern imaging of vagal paragangliomas and parathyroid adenomas.
• To discuss the evolving treatment paradigms for VPGLs.
• To highlight diagnostic and surgical considerations for paravagal parathyroid adenomas.

Main Methods:

• Literature review focusing on embryology, genetics, imaging, and treatment of vagal tumors.
• Analysis of current treatment trends for VPGLs, including surgery, abstention, and radiation therapy.
• Discussion of diagnostic modalities and surgical approaches for paravagal parathyroid adenomas.

Main Results:

• VPGLs are the second most common site of HNPGLs, frequently associated with SDHD gene mutations.
• Treatment for VPGLs has shifted towards non-surgical options like radiation therapy.
• Paravagal parathyroid adenomas require specific imaging and surgical approaches based on location.

Conclusions:

• Understanding the embryology, genetics, and imaging is crucial for managing tumors near the vagus nerve.
• Modern imaging and evolving treatment strategies are improving outcomes for VPGLs.
• Accurate diagnosis and tailored surgical techniques are essential for paravagal parathyroid adenomas.