Pannus—the growth of fibrovascular, fibroinflammatory, or fibrous tissue between the corneal epithelium and Bowman layer (Fig 6-12)—is frequently seen in cases of chronic corneal disease. Histologically, the term inflammatory is used when the Bowman layer is disrupted, because inflammatory conditions tend to destroy this layer. In contrast, degenerative is used when the Bowman layer remains intact under the fibrous or fibrovascular tissue.
Excerpted from BCSC 2020-2021 series: Section 4 - Ophthalmic Pathology and Intraocular Tumors. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.