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Focus on Ophthalmopathology - Orbital Infections from Hordeolum to Necrotizing Fasciitis.

(Peri)orbital infections comprise a multitude of diagnoses, ranging from common hordeolum to rare but life-threatening necrotizing fasciitis. However, these disease entities are rarely diagnosed by an ophthalmic pathologist because (peri)orbital infections are usually diagnosed clinically, with the help of imaging and microbiological techniques when indicated. In this review article, the role of ophthalmopathology in the diagnosis of (peri)orbital infections is illustrated on the basis of several exemple diagnoses. An infectious hordeolum must be distinguished from a noninfectious chalazion. A nodular thickening of the eyelid, which is diagnosed and treated as a chalazion, can hide a malignant neoplasia. The correct diagnosis and treatment of canaliculitis is often delayed. In this context the most common causative organism, Actinomyces, can be depicted histologically, as can lacrimal stones/dacryoliths. Necrotizing fasciitis is a rapidly worsening infection of the fascia, which can lead to necrosis, sepsis, and death. During the Sars-CoV2 pandemic, an increased incidence of mucormycosis cases was observed, especially in India. This superinfection was facilitated by the widespread use of steroids and immunosuppression. Histologically, it is possible to visualize infiltration of vessel walls by the fungus. Ophthalmopathology contributes to the diagnosis and to understanding the pathophysiology of these diseases.