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Facial swelling from canine space infection — ORE Part 1 MCQ

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HardApplied Dental SciencesFacial swelling from canine space infectionORE Part 1

A 30-year-old presents with swelling of the upper lip and obliteration of the nasolabial fold arising from an infected maxillary canine. The root apex lies superior to the insertion of levator anguli oris. There is tenderness in the canine fossa and mild early infraorbital puffiness. Which anatomical explanation best accounts for this pattern of spread?

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Correct answer: D — The infection perforates above levator anguli oris into the canine space

Explanation lettering: E = shown as B · B = shown as D · D = shown as E

B is correct. The canine space lies deep to the nasolabial fold and is related to the insertion of levator anguli oris. A long maxillary canine root may extend beyond this insertion; when a periapical infection perforates the labial cortex superior to it, pus enters the canine space. This produces upper-lip and nasolabial-fold swelling, canine-fossa tenderness and may cause early infraorbital puffiness. A is a mandibular pattern determined by the relation of mandibular roots to the mylohyoid line. C is not a direct drainage route for a maxillary canine infection. D is anatomically unrelated to this maxillary presentation. E incorrectly proposes a direct pathway through the pterygomandibular raphe into the orbit.

Reference: Hoerter JE, Malkin BD. Odontogenic Orofacial Space Infections. StatPearls, updated 2026. https://pubmed.ncbi.nlm.nih.gov/36943966/