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A 29-year-old woman presented with spontaneous-onset redness, pain, photophobia and diminution of vision in her right eye; best-corrected visual acuity (BCVA): 20/80. Examination revealed diffuse anterior scleritis with scleral thinning, near-total interstitial corneal haze and paracentral stromal crystal-like deposit (2×2 mm), with adjoining fine deep vessels arising from the nasal limbus (arrow, figure 1A,B). Bluish-grey appearance due to scleral thinning was most marked inferotemporally (arrow, figure 1C). The left eye had mild anterior scleritis; BCVA: 20/20 (figure 1D). Her intraocular pressure (IOP) was; 13 mm Hg (OD), 17 mm Hg (OS). Immunological investigations were negative for rheumatoid factor, antinuclear antibodies, antineutrophil cytoplasm antibody, anticyclic citrullinated peptides, HLA B-27, venereal disease research laboratory test, toxoplasma serology with normal complete haemogram, chest X-ray, thyroid-stimulating hormone; raised erythrocyte sedimentation rate (72 mm/hour), high sensitivity C reactive protein (6.89 mg/L), negative PCR of blood and conjunctival swab for herpes simplex virus.
She received oral prednisolone 60 mg/day (tapered 10 mg/week for 6 weeks and stopped), right eye, topical prednisolone acetate 1% 4 hourly and lubricant (carboxymethylcellulose 0.5%) therapy. The concentric interstitial haze in the paracentral cornea decreased with improvement in BCVA (20/30) and scleritis resolved, after 1 month. The central crystalline lipid deposit, adjoining the new vessels nasally, increased (figure 2A). She is advised topical steroids (topical prednisolone acetate 1%, three times a day) to date (1½ years), to prevent inflammatory exacerbation. However, the central lipid keratopathy has increased progressively nasally, replacing the interstitial haze (figure 2B). It is seen as a white fan-shaped crystalline opacification with refractile bodies in the stroma (4×5 mm), temporal to the deep vascular frond arising from the nasal limbus (figure 2B) (BCVA: 20/20, IOP: 12 mm Hg). This progression is also noted on anterior segment optical coherence tomography (AS-OCT) in the deep corneal stroma; clear areas overlying the pathology indicative of vessels (arrowheads, figure 3A,B). The neovascularisation seems to be causing progressive crystal-like keratopathy. Central corneal thickness is 532 µm (OD) and 562 µm (OS); the thinnest corneal point being superonasal periphery (between 5 and 7 mm): 311 µm (OD) measured with AS-OCT (figure 3C). At the last follow-up, she received a subconjunctival injection of bevacizumab (1.25 mg/0.05 mL).
Crystalline keratopathy with anterior sclerokeratitis has been reported earlier.1 Secondary lipid keratopathy following inflammatory keratitis with neovascularisation is usually of herpetic origin, though reported with bilateral scleritis, too.2 3 Neovascularisation is considered pathognomonic in secondary lipid keratopathy, as lipoproteins leaking from new vessels cause it.2 Topical and subconjunctival injection of anti- vascular endothelial growth factor (VEGF) has demonstrated positive results.4 Fine-needle diathermy and intravascular mitomycin C injections are important future therapies.2 Crystalline lipid deposit is seen in primary lipid keratopathy (Schnyder’s crystalline dystrophy), its pathophysiology being unclear.5 Unilateral crystalline keratopathy in infectious keratitis is well described.6 Other secondary causes of crystalline keratopathies such as monoclonal gammopathy and cystinosis are typically bilateral.7 8 We highlight the appearance of crystalline secondary lipid keratopathy in anterior sclerokeratitis through our case. The region of the cornea with new deep vessels showed progressive crystal-like lipid keratopathy, though inflammatory haze involved the entire cornea. There may be an overlap of crystalline morphology in postinflammatory secondary lipid keratopathy, appearing like Schnyder’s crystalline dystrophy.5
I don’t have any pain, watering, or irritation at present. Eye is fine, but vision is less in that eye. I am using drops regularly.
Secondary lipid keratopathy is seen in the presence of inflammation and corneal neovascularisation.
The crystalline morphology of lipid deposits may be seen in secondary lipid keratopathy, like primary lipid keratopathy.
Contributors GB, MV, NPJ and MM examined the patient and GB and MV treated the patient. All authors wrote the manuscript and approved it for publication.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.