The clinical image above depicts an ocular condition being managed surgically. Which of the following is the most likely diagnosis?

Explanation

## Image Findings * A fleshy, triangular, fibrovascular growth is visible, extending from the nasal conjunctiva onto the cornea. * The lesion appears to be encroaching towards the pupillary area. * A wire speculum is in place, holding the eyelids open, indicating an ocular procedure. * Surgical instruments (fine hook/spatula and forceps) are being used to manipulate the ocular tissues, suggesting surgical management. * Conjunctival hyperemia is noted around the lesion. ## Diagnosis **Key Point:** The image clearly shows a **pterygium**, characterized by a triangular fibrovascular growth extending from the conjunctiva onto the cornea. Pterygium is a common ocular surface disorder characterized by a wing-shaped, fleshy growth of conjunctival tissue that invades the superficial cornea. It typically originates from the nasal conjunctiva and is strongly associated with chronic exposure to ultraviolet (UV) radiation, dust, and wind. The presence of surgical instruments and a speculum indicates that the condition is being surgically addressed, which is the definitive treatment for symptomatic or visually significant pterygium. ## Differential Diagnosis | Feature | Pterygium | Pinguecula | Conjunctival Nevus | Conjunctival SCC | | :---------------- | :-------------------------------------- | :------------------------------------------ | :---------------------------------------- | :---------------------------------------- | | **Location** | Extends onto cornea (usually nasal) | Confined to conjunctiva, near limbus | Anywhere on conjunctiva, often pigmented | Anywhere on conjunctiva, often limbal | | **Appearance** | Fleshy, triangular, fibrovascular | Yellowish, raised, avascular | Pigmented (brown/black) or unpigmented, flat/slightly raised | Leukoplakic, fleshy, nodular, often with feeder vessels | | **Growth** | Progressive, invades cornea | Non-invasive, does not cross limbus | Stable, may rarely transform | Progressive, invasive, destructive | | **Symptoms** | Redness, irritation, astigmatism, vision loss if central | Irritation, cosmetic concern | Usually asymptomatic | Irritation, foreign body sensation, vision changes | | **Histopathology**| Elastotic degeneration of collagen, fibrovascular proliferation | Elastotic degeneration of collagen, no invasion | Nevus cells, melanin pigment | Dysplastic/malignant epithelial cells | ## Clinical Relevance **Clinical Pearl:** Pterygium can cause **induced astigmatism** due to corneal distortion and, if it encroaches on the visual axis, can lead to **vision impairment**. Surgical excision is indicated for visual obstruction, significant astigmatism, chronic irritation, or cosmetic concerns. ## High-Yield for NEET PG **High-Yield:** The most common location for pterygium is the **nasal conjunctiva**, extending onto the cornea. UV radiation is the primary risk factor. **Key Point:** Recurrence rates after simple excision are high; adjunctive therapies like **mitomycin C** or **conjunctival autograft** are used to reduce recurrence. ## Common Traps **Warning:** Confusing pterygium with pinguecula. Remember, **pinguecula does NOT cross the limbus** onto the cornea, while pterygium does. ## Reference [cite:Kanski's Clinical Ophthalmology Ch 4]