Résumé
To report a rare presentation of unifocal Langerhans cell histiocytosis [LCH] simulating a limbal papilloma. A 24-year-old man presented with a limbal mass in his left eye which had initially been suspected to be a papilloma based on clinical findings. The mass was excised and a histopathological diagnosis of "acute bullous inflammation with granulation tissue" was made. The lesion relapsed 10 months later which necessitated repeat resection along with corneoscleral patch grafting. Histopathological studies of the excised lesion led to a final diagnosis of LCH. To the best of our knowledge, this is the second report of a rare presentation of LCH in the limbus which recurred after excision of the primary mass. The recurrent lesion was diagnosed based on histopathology and managed accordingly.
Résumé
To compare Orbscan II and ultrasonic pachymetry for measurement of central corneal thickness [CCT] in eyes scheduled for keratorefractive surgery. CCT was measured using Orbscan II [Bausch and Lomb, USA] and then by ultrasonic pachymetry [Tomey SP-3000, Tomey Ltd, Japan] in 100 eyes of 100 patients with no history of ocular surgery scheduled for excimer laser refractive surgery. Mean CCT was 544.7 +/- 35.5 [range 453-637] micro m by ultrasonic pachymetry versus 546.9 +/- 41.6 [range 435-648] micro m measured by Orbscan II applying an acoustic factor of 0.92 [P=0.14]. The standard deviation of measurements was greater with Orbscan pachymetry but the difference was not statistically significant. CCT measurements by Orbscan II [applying an acoustic factor] and by ultrasonic pachymetry are not significantly different; however, when CCT readings by Orbscan II are in the lower range, it is advisable to recheck the measurements using ultrasonic pachymetry