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Advanced Technical IVT

ocular surface squamous neoplasia

Spectrum of epithelial malignancies affecting the conjunctiva and cornea, ranging from dysplasia to invasive squamous cell carcinoma.

Full Definition

Ocular surface squamous neoplasia (OSSN) represents a continuum of epithelial abnormalities affecting the conjunctiva, limbus, and cornea. The spectrum includes conjunctival intraepithelial neoplasia (CIN), carcinoma in situ, and invasive squamous cell carcinoma. Risk factors include UV exposure, HPV infection, HIV, and immunosuppression. Clinically, OSSN appears as elevated, gelatinous lesions with a papillomatous or leukoplakic surface, most commonly arising at the limbus. Early detection and complete excision with adjuvant therapy are essential for preventing progression to invasive carcinoma.

Usage

Usage note: OSSN is the preferred umbrella term over older classifications that separated these as distinct entities.

In Context

  • "The limbal lesion showed features consistent with ocular surface squamous neoplasia on histopathologic examination." — Pathology report
  • "Adjuvant mitomycin C was applied following excision of the ocular surface squamous neoplasia." — Surgical note

Also known as

OSSN conjunctival squamous cell carcinoma corneal intraepithelial neoplasia

Don't confuse with

pinguecula pterygium conjunctival nevus

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