Clinicopathological Characteristics of Ocular Surface Squamous Neoplasia: A 10-Year Review form a Referral Tertiary Centre in Nigeria

Background: Ocular surface squamous neoplasia is a heterogenous group of proliferative squamous lesions on the ocular surface with varying biologic behaviours. This study aims to report the clinical profile and pathologic characteristics of cases of OSSN seen at a tertiary referral centre in North West NigeriaMethods: A retrospective review of all cases of OSSN diagnosed over a 10-year period was doneResults: OSSN accounted for 68 out of 91 ocular surface lesions affecting twice as many males as females and a peak incidence in the 30-39 years age group. They frequently presented as higher grade and higher stage lesions with invasive squamous cell carcinoma being the most frequently diagnosed OSSN. They also frequently show association with HIV infection and a relatively long duration of symptoms before presentationConclusion: OSSN occur in a relatively young age group in our environment. Certain clinical and epidemiological features appear to [predict the occurrence of higher grade lesions and this may help in the clinical prediction of likely pathologic grade and/or biologic behaviour of these lesions.

Histopathology-guided management of ocular surface squamous neoplasia with corneal stromal or scleral invasion using ruthenium-106 plaque brachytherapy

Background/aimTo evaluate the safety and efficacy of ruthenium-106 (Ru-106) plaque brachytherapy in managing invasive ocular surface squamous neoplasia (OSSN).MethodsThis is a retrospective, non-comparative, interventional case series of 42 eyes with OSSN with histopathologically-proven corneal stromal and/or scleral invasion that underwent Ru-106 plaque brachytherapy. Main outcome measures were tumour regression, eye salvage, final visual acuity, treatment complications and metastasis.ResultsAt presentation, the mean tumour basal diameter was 9.3 mm (range 5–26 mm) and thickness 3.1 mm (range 1.5–11 mm). Prior treatment included excision biopsy in two patients (5%), incision biopsy and topical interferon in one each (2%). Following excision with 4 mm clinically clear margins, corneal stromal and/or scleral invasion of OSSN was confirmed in all 42 cases, with the excised base showing invasive squamous cell carcinoma. A total dose of 5000 cGy over a mean duration of 19.7 hours (range 7–41 hours) was provided to an axial depth of 2 mm using Ru-106 surface plaque. Over a mean follow-up of 36.9 months (range 22.3–72 months), complete tumour regression was achieved in all eyes (100%). Two eyes (5%) showed conjunctival tumour growth remote from the site of prior treatment. Visual acuity was maintained at ≥20/200 in 35 eyes (83%), with a loss of >2 Snellen lines in 1 eye (2%). There was no evidence of regional lymph node or systemic metastasis.ConclusionHistopathology-guided use of Ru-106 surface plaque brachytherapy is a safe and an effective adjuvant therapy in the management of corneal stromal and/or scleral invasion of OSSN.

Spontaneous regression of presumed ocular surface squamous neoplasia: A report of 8 cases

Purpose To report the phenomenon of spontaneous regression in presumed ocular surface squamous neoplasia (OSSN) Methods Retrospective chart review of clinically diagnosed cases of OSSN during 2016 to 2019 Results Of the 449 OSSN lesions, spontaneous regression was seen in 8 lesions (2%). The mean age at diagnosis of OSSN was 37 years (median, 36 years; range, 21 to 59 years). All were males with unilateral, treatment-naïve tumors. Mean duration of symptoms was 3 months (median, 2 months; range, 1 to 12 months). All tumors arose within the interpalpebral region, located in the nasal quadrant in 88% (n = 7) and in temporal quadrant in 12% (n = 1). The mean tumor diameter was 4 mm (median, 4 mm; range, 3 to 5 mm). Lesions showed nodular (n = 4; 50%) or placoid (n = 4; 50%) morphology. The other features included keratin production and intrinsic vascularity (n = 8; 100%), feeder vessels (n = 4; 50%), and intratumoral pigmentation (n = 4; 50%). The diagnosis of OSSN was confirmed by classic anterior segment optical coherence tomography (AS-OCT) features. Tumors regressed after a mean period of 5 months (median, 4 months; range, <1 to 17 months) from presumed onset and a mean period of 2 months (median, 1 month; range, <1 to 6 months) from presentation to the clinic. No recurrences were noted at a mean follow up of 37 months (median, 35 months; range, 17 to 52 months) after spontaneous regression of tumors. Conclusion OSSN can spontaneously regress in 2% of cases. Immune-mediated reversal of dysplastic changes may explain this phenomenon. Précis In this study, spontaneous regression of presumed ocular surface squamous neoplasia was noted in 2% patients. Tumor regression resulted in restoration of normal epithelial architecture and no recurrences were observed during the follow-up period.