During four-gland parathyroid exploration, which pair of glands has the most constant anatomical position and is therefore most reliably identified at operation?
- A Both superior glands, near the cricothyroid junction posterior to the recurrent laryngeal nerve ✓
- B Both inferior glands, within the thymus
- C Right superior and left inferior glands
- D Both inferior glands, anterior to the trachea
Correct answer: A. Both superior glands, near the cricothyroid junction posterior to the recurrent laryngeal nerve
Explanation
Superior parathyroids arise from the fourth pharyngeal pouch and descend only a short distance, so they remain close to the cricothyroid junction, typically posterior to the upper recurrent laryngeal nerve, in about 80 percent of cases. Inferior glands arise from the third pharyngeal pouch with the thymus and migrate further, giving them far more variable positions including intrathymic, carotid sheath, and mediastinal sites. This greater migration is exactly why option B is wrong.
Reference: Sabiston Textbook of Surgery, 21st ed.
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Written and medically reviewed by the StethoPrep medical team.