Anatomy Pelvis Head Neck · Year 1 · from Anatomy Pelvis Head Neck
Case 2: Cavernous Sinus Thrombosis
Patient Demographics
- Age: 25 years old
- Sex: Male
- Occupation: College student
Chief Complaint
Severe headache, eye swelling, and double vision for 3 days following a facial infection.
History of Present Illness
The patient developed a "pimple" on the right side of his nose approximately 1 week ago. He attempted to squeeze and pop the lesion multiple times. Over the following 3 days, he developed progressive right periorbital swelling, headache, and fever. He presented to an urgent care clinic and was prescribed oral antibiotics for facial cellulitis. Despite 2 days of antibiotics, his symptoms worsened significantly. He now has bilateral eye swelling (initially only right, now spreading to left), severe headache, double vision, and high fevers (up to 39.5C). He also reports right facial numbness over the cheek and forehead.
Physical Examination
- Vitals: HR 115 bpm, BP 100/65 mmHg, Temp 39.8C, appearing toxic
- Head examination:
- Bilateral periorbital edema with erythema (right worse than left)
- Proptosis (forward displacement of the eye) bilaterally
- Chemosis (conjunctival swelling) bilaterally
- Crusted lesion on right nasal ala with surrounding cellulitis
- Neurological examination:
- CN III: Right pupil dilated, sluggish response; limited upward, downward, and medial gaze on right
- CN IV: Limited downward gaze when adducted (right)
- CN VI: Limited lateral gaze (right)
- CN V1/V2: Decreased sensation over right forehead and cheek
- Fundoscopy: Papilledema bilaterally, dilated retinal veins
Imaging Workup
- CT head with contrast: Filling defects in both cavernous sinuses, more prominent on right; proptosis bilaterally; inflammatory changes in the right orbit and face
- MRI/MRV brain: Confirms bilateral cavernous sinus thrombosis with surrounding inflammatory changes
Laboratory Studies
- Blood cultures: Positive for Staphylococcus aureus
- CBC: WBC 22,000 with left shift
- Inflammatory markers: CRP 285 mg/L, Procalcitonin elevated
Diagnosis
Septic Cavernous Sinus Thrombosis secondary to nasal furuncle (facial infection in the "danger triangle")
Anatomical Correlation
The "danger area of the face" is the triangular region bounded by the corners of the mouth and the bridge of the nose. This area drains via the facial vein and angular vein, which communicate with the cavernous sinus through two routes: (1) the superior ophthalmic vein, which drains directly into the cavernous sinus, and (2) the deep facial vein, which connects to the pterygoid plexus, which in turn communicates with the cavernous sinus. Critically, these veins are valveless, allowing blood (and infection) to flow in either direction. The cavernous sinuses are paired dural venous sinuses located on either side of the sella turcica. They have a complex trabeculated structure containing several important structures: the internal carotid artery and abducens nerve (CN VI) pass through the center, while the oculomotor nerve (CN III), trochlear nerve (CN IV), and ophthalmic (V1) and maxillary (V2) divisions of the trigeminal nerve course within the lateral wall. When infection spreads to the cavernous sinus, thrombosis and inflammation affect these structures, producing the classic findings: ophthalmoplegia (CN III, IV, VI), facial sensory loss (CN V1, V2), proptosis and chemosis (venous congestion), and papilledema. Bilateral involvement occurs because the cavernous sinuses communicate via intercavernous sinuses.
Treatment
- Broad-spectrum IV antibiotics: Vancomycin plus ceftriaxone or meropenem; adjust based on cultures
- Prolonged antibiotic course: Typically 3-4 weeks IV followed by oral antibiotics
- Anticoagulation: Controversial but generally recommended to prevent thrombus propagation
- Surgical drainage: Of primary infection source if abscess present
- ICU monitoring: High mortality condition requiring close observation
- Prognosis: Mortality 20-30% even with treatment; high rate of neurological sequelae