Which statement about orbital pseudotumor is true?

• A. It does not involve scarring of mucous membranes
• B. It commonly presents with symblepharon
• C. It is a mucous membrane pemphigoid
• D. It is primarily a conjunctival degenerative disease

Answer: (A)

Orbital pseudotumor is an idiopathic inflammatory process of the orbit that can involve various orbital structures, but it does not characteristically cause scarring of mucous membranes. Mucous membrane scarring, such as symblepharon, is a hallmark of mucous membrane pemphigoid (occult conjunctival cicatrization). Since orbital pseudotumor lacks this cicatrizing mucosal feature, the statement that it does not involve scarring of mucous membranes is true. The other options describe features more typical of cicatrizing conjunctival disease or degenerative processes, not of the orbital inflammatory condition.