Which artery is most likely occluded causing mottling of the right chin and nose?

Vascular Occlusion of Right Chin and Nose: Arterial Anatomy

The facial artery is the most likely vessel occluded when mottling affects both the right chin and nose, as it is the primary blood supply to the anterior face and provides branches to both regions. 1, 2

Anatomical Basis for This Presentation

The facial artery originates from the external carotid artery and courses superiorly across the face, giving off multiple branches that supply overlapping territories 2:

• Inferior labial artery - supplies the lower lip and chin region 2, 3
• Superior labial artery - supplies the upper lip (present in 82.2% of cases) 3
• Lateral nasal artery - supplies the nose (present in 25.1% of cases) 3
• Angular artery - terminal branch supplying the medial canthal and nasal region (present in 42.5% of cases) 3

The facial artery typically courses medially to the nasolabial fold in 65.5% of cases, positioning it to supply both the chin and nasal regions through its sequential branches 3. The horizontal distance from the oral commissure to the facial artery averages 8.5 ± 4.0 mm, and from the naris to the facial artery is 12.1 ± 6.7 mm 3.

Why This Matters Clinically

Facial artery occlusion causing simultaneous chin and nose mottling represents a vascular emergency requiring immediate evaluation for embolic source or iatrogenic injury. 4

Critical Etiologies to Consider:

Iatrogenic causes are particularly important in this distribution:

• Inadvertent injection of filler material into facial artery branches during cosmetic procedures can cause arterial occlusion with devastating consequences 4
• The prognosis is generally poor with synthetic filler embolization because the material is not fibrin-based and does not respond to thrombolysis 4

Embolic occlusion from proximal sources:

• The facial artery can be affected by emboli from the ipsilateral internal carotid artery, aortic arch, or cardiac sources 4
• This would be analogous to retinal artery occlusion mechanisms, where embolic material lodges at arterial bifurcation points 4

Vasculitis should be considered, particularly:

• Giant cell arteritis (GCA) in patients over 50 years old, which causes inflammatory vessel wall thickening and occlusion 5, 6
• Other systemic vasculitides including granulomatosis with polyangiitis, polyarteritis nodosa, or systemic lupus erythematosus 6

Immediate Management Algorithm

1. Assess for iatrogenic cause: Recent facial cosmetic procedures (filler injections, botulinum toxin) within the past 24-48 hours 4, 2

2. Evaluate for GCA if patient >50 years old 5:

   • Headache, scalp tenderness, jaw claudication
   • Temporal artery tenderness on examination
   • If suspected, initiate high-dose corticosteroids immediately before confirmatory testing 5

3. Urgent vascular imaging with CTA of head and neck to:

   • Confirm arterial occlusion location 4
   • Identify embolic source or vessel wall abnormalities 4
   • Rule out carotid or proximal vessel disease 4

4. Embolic workup including 4:

   • Electrocardiogram for atrial fibrillation
   • Echocardiography for cardiac source
   • Carotid duplex ultrasound

Critical Pitfalls to Avoid

• Do not delay imaging if iatrogenic filler injection is suspected - tissue necrosis can progress rapidly and synthetic fillers do not respond to standard thrombolytic therapy 4

• Do not miss GCA - this is an ophthalmologic and vascular emergency requiring immediate corticosteroid treatment to prevent bilateral vision loss and stroke 5, 6

• Consider the angular artery as an alternative culprit - it connects to the ophthalmic artery branches and can cause similar distribution of ischemia when occluded, though it originates from the facial artery in only 42.5% of cases 2, 3

The lateral branches of the facial artery, including the premasseteric branch (present in 51.4% of cases), typically supply more lateral facial structures and would be less likely to cause this specific pattern 7.