Which is considered the most common conjunctival neoplasm?

• A. Conjunctival Intraepithelial Neoplasia (CIN)
• B. Conjunctival nevus
• C. Squamous cell carcinoma
• D. Pyogenic granuloma

Answer: (A)

Conjunctival intraepithelial neoplasia is the most frequently seen neoplastic process arising from the conjunctival surface. It represents the preinvasive end of the spectrum of ocular surface squamous neoplasia, with abnormal squamous cells confined to the epithelium and no invasion of the basement membrane. Clinically it often presents as a gelatinous or leukoplakic patch at the limbus or bulbar conjunctiva, sometimes with feeder vessels, and can be mistaken for benign or reactive lesions until biopsy or characteristic features guide management. The reason this is the best answer is that, among conjunctival neoplasms, CIN is the most commonly diagnosed neoplastic lesion on the ocular surface, marking an important early, treatable stage before progression to invasive squamous cell carcinoma. Treatment typically involves surgical excision with cryotherapy and may include topical chemotherapy or other adjuvants; recognizing CIN early improves prognosis. While benign conjunctival nevus is a common pigmented lesion and squamous cell carcinoma is a malignant option, CIN is the most frequently encountered neoplastic process in this category.