Silent Intruders: Air in the Cavernous Sinus and Neck Spaces-A Case Report.

Introduction: Air in the cavernous sinus is rare and often linked to severe conditions like trauma, septic thrombosis, or gas-forming infections. However, advances in imaging and awareness of iatrogenic causes suggest it may also result from transient, self-limiting venous air embolism, especially after routine procedures like peripheral intravenous canulation. Case Presentation: A middle-aged diabetic male presented to the emergency department with dizziness and persistent nausea for two days. There was no history foe headache, fever or blurring of vision. On examination, he was severely dehydrated with reduced skin turgor and resting tachycardia. The patient was treated with intravenous hydration with improvement in his symptoms. Laboratory investigations showed only mild hyperglycemia with high lactic acid. Initial non-contrasted computed tomography (CT) of the head revealed air within the cavernous sinus and neck spaces. Four hours later, a repeated contrast-enhanced CT of the head and neck showed complete spontaneous resolution of the cavernous gas bubbles. Recent peripheral intravenous canulation was the likely cause of transient venous air embolism in this case. Conclusion: This case underscores the importance of differentiating benign, iatrogenic causes of pneumatosis from life-threatening conditions to prevent unnecessary interventions. Clinicians should consider recent intravenous canulation as a potential benign cause in clinically stable and asymptomatic patients, while systematically excluding other serious pathologies.