Pellucid marginal degeneration (PMD) is an idiopathic, progressive, non-inflammatory, ectatic corneal disorder characterized by a peripheral inferior band of corneal thinning in a crescent-shaped pattern 1, although PMD cases with areas of superior thinning have been reported 2. The “bell” sign on the PM is a deferential diagnostic sign in PMD. Cone location does not relate to diagnosis. Conclusion: The claw pattern on the ASM is not a hallmark of PMD it can be seen in PLK. In group 2, the AEM in the BFS mode revealed the kissing birds sign in 2 eyes (18.2%), and the cone was central in 1 eye (9.1%), paracentral in 8 eyes (72.7%) and peripheral in 2 eyes (18.2%). PM showed the bell sign in 4 eyes (100%). In group 1, the AEM in the best fit sphere (BFS) mode revealed no kissing birds sign, and the cone was central in 1 eye (25%) and paracentral in 3 eyes (75%). The ASM, anterior elevation map (AEM) and PM were analyzed and compared to study the “kissing birds” sign, the “bell” sign, and cone location. Patients were studied using slitlamp biomicroscopy and Scheimpflug-based tomography (Pentacam HR). Patients were distributed into two groups: (1) 4 eyes were considered PMD since they had inferior corneal thinning on both slitlamp biomicroscopy and PM (2) 11 eyes were considered as PLK since they did not show inferior corneal thinning. Clinical and tomographic findings of 15 eyes (9 patients) that had the claw pattern of the anterior sagital map (ASM) were reviewed.
#Pellucid marginal degeneration icd 9 series#
Patients and methods: A retrospective descriptive case series was performed in Damascus University in 2011. Purpose: To study the tomographic features of pellucid-like keratoconus (PLK), and to report a new sign on the pachymetry map (PM) in pellucid marginal degeneration (PMD).
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