In a modified radical neck dissection (MRND), which of the following structures is routinely PRESERVED compared to a radical neck dissection?
- A Internal jugular vein only
- B Spinal accessory nerve, internal jugular vein, and sternocleidomastoid muscle ✓
- C Sternocleidomastoid muscle only
- D Spinal accessory nerve only
Correct answer: B. Spinal accessory nerve, internal jugular vein, and sternocleidomastoid muscle
Explanation
Modified radical neck dissection removes the same cervical lymph node groups (levels I–V) as radical neck dissection but preserves one or more of the three non-lymphatic structures: the spinal accessory nerve (CN XI), the internal jugular vein, and the sternocleidomastoid muscle. MRND Type III preserves all three structures. Preserving the spinal accessory nerve prevents the shoulder dysfunction (dropped shoulder, winged scapula) that characterizes radical neck dissection.
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.