Statistics from Altmetric.com
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.
Osteogenesis imperfecta is a group of inherited disorders, usually inherited as an autosomal dominant trait, characterised by quantitative and qualitative defects in type I collagen.1 2 Osteogenesis imperfecta is characterised by increased bone matrix mineralisation resulting in increased bone stiffness and brittleness, making them prone to fracture (figure 1A,B). Similarly, excessive mineralisation of the elastin-rich Bruch’s membrane can lead to ruptures in the membrane with or without concurrent disruption of the overlying layers of the retina and the underlying choriocapillaris.3 Mineralisation of Bruch’s membrane in this way is responsible for the formation of angioid streaks (figure 1C,D). This localised defect can lead to the formation of choroidal neovascularisation—as seen in the left eye (figure 1D), which can result in the formation of a disciform scar with a detrimental effect on visual acuity—as observed in the right eye.
Comet lesions are solitary, nodular, crystalline or white spots of chorioretinal atrophy, with a tapered tail of retinal pigment epithelium atrophy, oriented towards the optic disc, irrespective of their location.4 These lesions are more commonly appreciated in pseudoxanthoma elasticum-related retinopathy. A spray of comet lesions creates an appearance of ‘comet rain’, typically arranged between the main vascular arcades. We could appreciate the comet rain appearance inferiorly between the inferotemporal and inferonasal arcades in our patient (figure 1C,D). These lesions are thought to form due to focal interruption of Bruch’s membrane with consequent degeneration or absence of the underlying retinal pigment epithelium, triggering an attempt to repair the overlying photoreceptors.5
Visual loss from the complications of choroidal neovascular membrane formation, depicted by the breach in the Bruch’s membrane—RPE in both eyes on Optical Coherence Tomography (OCT) (figure 1E,F) can be delayed by antivascular endothelial growth factor therapy. Therefore, it is imperative that patients with osteogenesis imperfecta have regular retinal evaluation, so as to enable timely diagnosis and treatment (figure 1G,H). The presence of a macular scar at the time of initial presentation in this patient can be attributed to the failure of retinal screening.
Retinal evaluation at regular intervals should be undertaken for timely diagnosis and intervention of ocular complications in osteogenesis imperfecta.
Comet lesions have been described in pseudoxanthoma elasticum. Here, we describe them in osteogenesis imperfecta.
Visual loss from choroidal neovascular membrane formation can be delayed by antivascular endothelial growth factor therapy.
Patient consent for publication
Contributors The following authors were responsible for drafting of the text, sourcing and editing of clinical images, investigation results, drawing original diagrams and algorithms, and critical revision for important intellectual content: MB, SV and SVA. The following author gave final approval of the manuscript: PV.
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.
Case reports provide a valuable learning resource for the scientific community and can indicate areas of interest for future research. They should not be used in isolation to guide treatment choices or public health policy.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.