|LETTER TO EDITOR
|Year : 2020 | Volume
| Issue : 1 | Page : 156
Coloboma of the right eye: Findings on ultrasonography
Varun Singh, Suresh Phatak
Department of Radiodiagnosis, Jawaharlal Nehru Medical College, Datta Meghe Institute of Medical Sciences (Deemed to be University), Wardha, Maharashtra, India
|Date of Submission||17-Jun-2019|
|Date of Decision||20-Sep-2019|
|Date of Acceptance||20-Sep-2019|
|Date of Web Publication||13-Oct-2020|
Dr. Suresh Phatak
Department of Radiodiagnosis, Jawaharlal Nehru Medical College, Sawangi (Meghe), Wardha - 442 001, Maharashtra
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Singh V, Phatak S. Coloboma of the right eye: Findings on ultrasonography. J Datta Meghe Inst Med Sci Univ 2020;15:156
We present ultrasonographic imaging in a case of coloboma of the choroid which is a quite rare condition. This patient presented with cataract and microphthalmia.
A coloboma is a gap or a defect which results due to failure of the choroidal fissure to close; the choroidal fissure is an embryologic structure through which the hyaline vasculature passes. Coloboma can affect any part of the globe. A typical choroidal coloboma is present in the inferior-nasal fundus, and severe forms can also involve the posterior area. Coloboma can be unilateral or bilateral and is usually associated with microphthalmos and clinically present as scleral ectasia.
 The most common syndrome associated with coloboma is CHARGE syndrome, consisting of coloboma, heart anomalies, choanal atresia, growth retardation, trisomy 13, trisomy 18, and cat eye syndrome. Other associated eye anomalies with coloboma include microphthalmia, heterochromia, glaucoma, and cataract and the most common complications associated are retinal detachment and cataract.
On magnetic resonance imaging scan, the findings described in literature are homogenous cystic lesion which is associated with a small-sized globe, occupying the retrobulbar area without hemorrhage, calcification, or any postcontrast enhancement within the cyst, as well as no obvious communication between the cyst and intracranial structures. T2-weighted (T2W) images show unilateral hyperintense to vitreous cystic lesions with increased apparent diffusion coefficient values and isointense to hypointense to vitreous on T1W and FLAIR images in the intraconal retrobulbar location, encasing optic nerves [Figure 1].
|Figure 1: B-scan of the right eye showing evidence of defect in the posterior aspect of the globe noted at the level of insertion of optic disc head showing herniation of vitreous the defect measuring 7.15 mm in width and 5.08 mm in depth. The scan also showing multiple membranes with low levels of echoes in the vitreous chamber and cataract|
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| References|| |
Rathi A, Takkar B, Venkatesh P, Gaur N, Kumar A. Ultrasonographic evaluation of transition from normal to ectatic area: A comparison between myopic staphylomata and coloboma. Indian J Ophthalmol 2017;65:1030-2.
] [Full text]
Herren DJ, Mawn LA, Patel AS, Burkat CN, Herren DJ, Stelzner SK, et al
. Coloboma. Available from: https://eyewiki.aao.org/Coloboma
. [Last accessed on 2019 May 20].
James JM, Puranik MP, Sowmya KR. Dentinal tubule occluding effect of potassium nitrate in varied forms, frequencies and duration: An in vitro
SEM analysis. J Clin Diagn Res 2017;11:ZC06-8.