During drainage of a peritonsillar abscess, what is the MOST common site for the abscess to be located, and which important structure must the surgeon avoid by limiting needle insertion depth to 1 cm?

• A Inferior pole of tonsil; lingual artery
• B Superior pole at the junction of the anterior pillar and tonsil; internal carotid artery ✓
• C Posterior to the tonsil; external carotid artery
• D At the posterior pillar; jugular vein

Explanation

Peritonsillar abscess most commonly forms at the superior pole of the tonsil, between the tonsillar capsule and the superior constrictor muscle, at the junction of the anterior pillar (palatoglossal arch) and the upper pole. The internal carotid artery lies approximately 2.5 cm posterolateral to the tonsillar fossa; needle insertion must be limited to 1 cm depth to avoid vascular injury. Incision is made at the point of maximum fluctuation, typically at the superior pole of the anterior pillar. This explains why needle aspiration is preferred initially.

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

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Written and medically reviewed by the StethoPrep medical team.