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What Is Pseudodendritic Keratitis?

Pseudodendritic keratitis is corneal surface disease in which lesions resemble herpes simplex dendrites but lack true branching ulcer edges and terminal bulbs. The epithelium may be elevated, irregular, or superficially eroded rather than a classic linear ulcer. Common causes include herpes zoster ophthalmicus, medicamentosa from topical drugs, healing epithelial defects, and some toxic or immune conditions. Symptoms include pain, foreign body sensation, and light sensitivity. Mislabeling these lesions as herpes simplex can lead to inappropriate treatment.

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What Is Pseudodendritic Keratitis?

Pseudodendritic keratitis is corneal surface disease in which lesions resemble herpes simplex dendrites but lack true branching ulcer edges and terminal bulbs. The epithelium may be elevated, irregular, or superficially eroded rather than a classic linear ulcer. Common causes include herpes zoster ophthalmicus, medicamentosa from topical drugs, healing epithelial defects, and some toxic or immune conditions. Symptoms include pain, foreign body sensation, and light sensitivity. Mislabeling these lesions as herpes simplex can lead to inappropriate treatment.

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Causes of Pseudodendritic Lesions

Herpes zoster related pseudodendrites are often plaque like, with blunted ends and less central staining than true dendrites. Toxic reactions to antivirals, glaucoma drops, or other medications can create linear, map like epithelial changes that mimic dendrites. Healing after abrasions or neurotrophic keratopathy may leave irregular epithelial ridges with partial staining. Rarely, other infections or immune reactions produce similar patterns. Careful history and staining characteristics help separate these from classic herpetic ulcers.

Symptoms and Clinical Features

Patients commonly report discomfort, tearing, and photophobia, sometimes alongside lid or skin lesions in zoster. Visual blur depends on lesion size and location. On slit lamp exam, pseudodendrites often appear as slightly elevated, grayish epithelial plaques with minimal central ulceration and without the bright terminal bulbs seen in herpes simplex dendrites. Staining with fluorescein and rose bengal or lissamine green highlights different parts of the lesion than in true dendrites. Corneal sensation may be reduced in neurotrophic or zoster related cases.

How Is Pseudodendritic Keratitis Diagnosed?

Diagnosis is clinical and relies on recognizing the atypical appearance and context. The eye doctor reviews drug use, prior herpes infections, skin rashes, and any recent trauma. Careful staining patterns, lesion edges, and response to initial therapy help distinguish pseudodendrites from active herpes simplex. In unclear cases, PCR testing of tear or corneal samples or consultation with a cornea specialist is considered. Accurate diagnosis prevents misuse of steroids or antivirals.

How Is Pseudodendritic Keratitis Managed?

Treatment targets the underlying cause. In herpes zoster, systemic antivirals are used and topical steroids may be added for inflammation under supervision. Toxic or medicamentosa cases are treated by stopping the offending drop and supporting the surface with lubricants and sometimes bandage lenses. Neurotrophic or healing related lesions benefit from aggressive lubrication, protective strategies, and sometimes agents that promote epithelial healing. Management is individualized rather than following standard herpes simplex ulcer protocols.

FAQs About Pseudodendritic Keratitis

How can doctors tell pseudodendrites from true herpes dendrites?

True herpes simplex dendrites are branching ulcers with bright terminal bulbs and central fluorescein staining, while pseudodendrites are often elevated plaques with blunted ends and different staining. History and associated findings provide extra clues.

Are pseudodendrites less serious than herpes simplex ulcers?

They can still threaten vision if associated with zoster, neurotrophic disease, or severe toxicity. The seriousness depends on the cause and depth, not just the shape. Proper diagnosis guides appropriate intensity of treatment.

Should pseudodendritic keratitis always be treated with antivirals?

No, antivirals are helpful in zoster related disease but not in purely toxic or healing related pseudodendrites. Using antivirals alone can delay needed changes such as stopping a harmful drop.

Can pseudodendritic lesions recur?

Yes, recurrence can happen if the underlying trigger, such as zoster, chronic toxicity, or neurotrophic disease, persists. Ongoing management of those conditions is important to reduce future episodes.