In a modified radical neck dissection (type III), which of the following structures are preserved?
- A Internal jugular vein, sternocleidomastoid muscle, and spinal accessory nerve ✓
- B Spinal accessory nerve only
- C Internal jugular vein and spinal accessory nerve, but not SCM
- D Sternocleidomastoid muscle only
Correct answer: A. Internal jugular vein, sternocleidomastoid muscle, and spinal accessory nerve
Explanation
Modified radical neck dissection (MRND) removes all ipsilateral cervical lymph node groups (levels I-V) like a radical neck dissection but preserves one or more non-lymphatic structures. Type I preserves the spinal accessory nerve; Type II preserves the spinal accessory nerve and internal jugular vein; Type III (the most common modification) preserves all three: spinal accessory nerve, internal jugular vein, and sternocleidomastoid muscle. This reduces functional morbidity while maintaining oncological adequacy for most head and neck tumors.
Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.