Diabetics and immunocompromised patients are at risk for which aggressive fungal infection associated with orbital involvement?

• A. Mucormycosis
• B. Aspergillosis
• C. Candidiasis
• D. Cryptococcosis

Answer: (A)

Aggressive invasive fungal infections in diabetics and immunocompromised patients that involve the orbit are classic for mucormycosis. This organism invades blood vessels (angioinvasion) and causes rapid tissue necrosis, allowing the infection to spread from the sinuses into the orbit and sometimes the brain. Clinically you’ll see acute sinusitis with facial pain and often a black necrotic nasal/eschar, followed by proptosis, ophthalmoplegia, and vision loss as the infection extends to the orbit. The combination of uncontrolled diabetes, especially with ketoacidosis, and rapid orbital involvement makes mucormycosis the best-known and most feared cause in this scenario. While other fungi like aspergillosis can affect the orbit, mucormycosis is the strongest association in diabetics and immunocompromised patients with rhinocerebral-orbital spread. Management requires urgent antifungal therapy and prompt surgical debridement.