A modified radical neck dissection (MRND) Type III differs from a radical neck dissection in that it preserves:

• A Internal jugular vein only
• B Spinal accessory nerve only
• C Sternocleidomastoid muscle only
• D Spinal accessory nerve, internal jugular vein, and sternocleidomastoid muscle ✓

Explanation

MRND Type III (Bocca's operation) preserves all three non-lymphatic structures — the spinal accessory nerve (CN XI), the internal jugular vein, and the sternocleidomastoid muscle — while removing all five nodal levels (I–V). MRND Type I preserves only the spinal accessory nerve; Type II preserves the nerve and internal jugular vein. The radical neck dissection removes all structures including these three.

Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.

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Written and medically reviewed by the StethoPrep medical team.