Cavernous sinus thrombosis, a dangerous complication of facial/paranasal infections, involves the valveless venous communication via which vein that allows spread from the 'danger triangle' of the face?

• A Inferior petrosal sinus
• B Superior ophthalmic vein ✓
• C Superficial middle cerebral vein
• D Emissary veins of the parietal foramina

Explanation

Infection from the 'danger triangle' of the face (between the corners of the mouth and the nasal bridge) spreads to the cavernous sinus via the angular vein → superior ophthalmic vein → cavernous sinus route. The superior ophthalmic vein, which lacks valves, connects the facial veins to the cavernous sinus. Retrograde septic thrombophlebitis is facilitated by raised venous pressure during squeezing of nasal/upper lip furuncles. The inferior petrosal sinus drains the cavernous sinus, not into it.

Reference: BD Chaurasia's Human Anatomy, 8th ed.

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