Which ocular condition does NOT typically involve scarring of mucous membranes?

• A. OCP
• B. Orbital pseudotumor
• C. Steven-Johnson Syndrome
• D. Trachoma

Answer: (B)

Mucous membrane scarring in the eye refers to cicatrizing conjunctivitis, where the conjunctiva—an ocular surface mucosa—progressively fibroses. This kind of scarring leads to features like fornix foreshortening and symblepharon, and is a hallmark of several ocular inflammatory diseases. Ocular cicatricial pemphigoid is autoimmune and targets mucous membranes, causing progressive conjunctival fibrosis. Stevens-Johnson syndrome involves mucous membranes, including the eye, and can result in conjunctival scarring. Trachoma is a chronic conjunctivitis from Chlamydia infection that also culminates in conjunctival scarring and eyelid deformities. Orbital pseudotumor, by contrast, is an inflammatory condition of the orbit’s soft tissues and does not characteristically involve scarring of the conjunctival mucous membranes.