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These abnormally large vessels may cause disturbances in the overlying retinal pigment epithelium (RPE) and the development of subretinal fluid. Some CMs can even masquerade as a choroidal tumour or parasitic infestation.
; the latter may represent the origin of most CMs and may explain why almost all previously reported CMs arise in the macula. An extramacular origin for CM is rare, and to our knowledge, there are only 2 cases described in the literature. Of these 2 cases, only 1 was illustrated with retinal imaging, which appears to show an origin of the anomalous vessel within the macula.
In this correspondence, we describe and illustrate an extramacular CM that clearly originates in an extramacular location superior to the optic disc, as shown with ultra-wide-field (UWF) ICGA. This work was completed at the retinal disorders and ophthalmic genetics division at the Stein Eye Institute, University of California–Los Angeles.
A 58-year-old patient was referred for an evaluation of floaters and photopsia in the left eye for 5 days. Past medical history included hypertension and hypothyroidism secondary to thyroidectomy to treat thyroid cancer 8 years prior. Ocular history was remarkable for anisometropic myopia with a spherical equivalent of –2.25 D in the right eye and –6.50 D in the left eye.
On examination, visual acuity was 20/25 OD and 20/20 OS with normal anterior segments OU. Ophthalmoscopy demonstrated RPE mottling superior to the optic disc OS (Fig. 1A). UWF fundus autofluorescence showed a corresponding area of hyperautofluorescence (Fig. 1B). Optical coherence tomography B-scans through this region showed a large (380 µm in height) choroidal vessel with overlying subretinal fluid, focal elevation of the RPE–Bruch membrane complex, and elongated photoreceptor outer segments (Fig. 2). UWF ICGA revealed early arterial filling of a large dilated and tortuous extramacular CM originating superior to the optic disc and extending into the superior periphery without late leakage or staining (Fig. 3A). There was marked asymmetry of choroidal venous drainage, with reduced venous drainage directed toward the inferonasal vortex ampulla (Fig. 3B).
reported a possible association of CM with myopia. They reviewed the fundus images of 13 cases of CM and identified features of high myopia, including fundus tessellation and peripapillary atrophy in 11 of these patients. The patient reported herein exhibited high myopia with a refraction of –6.50 D OS. Of interest, retinal arterial tortuosity was identified only in this subject’s left eye. The coexistence of CM with retinal arterial tortuosity may be coincidental or may be related to an underlying vascular disorder involving both systems.
The presence of RPE mottling and subretinal fluid can be associated with CM.
These pathoanatomical complications may develop from compression of the overlying inner choroid leading to RPE dysfunction. A similar pathogenesis may explain the development of pigmentary changes and fluid in eyes with choroidal nevi or overlying dilated veins (pachyvessels) in eyes with pachychoroid disease.
studied the PCA circulation and noted the presence of typically 1 to 5 PCAs. The lateral and medial PCAs (of the short posterior ciliary system) are most commonly identified (97%–100% of eyes), but the superior PCA is an uncommon branch that exists in 9% of eyes. The PCAs branch into short and long PCAs. The short PCAs pierce the sclera in 2 locations. The paraoptic short PCAs enter adjacent to the optic disc and the distal short PCAs enter nasal or temporal to the disc. In contrast, the long lateral PCA enters the sclera temporal to the macula. Use of UWF ICGA in our case clearly demonstrates the medial and lateral distal short PCAs as well as the long PCAs. Remarkably, a single superior PCA that is dilated and tortuous is also identified and represents the CM (Fig. 3). This anomalous pattern of circulation can be detected in less than 10% of normal subjects. Most previously reported CMs originate from the temporal distal short PCA, which may explain the remarkable macular predominance for this vascular entity.
To our knowledge, this is the only reported case of a CM originating from the superior PCA and the only illustration of this uncommon vascular pattern with ICGA. The extramacular origin of the CM is rare and can be easily overlooked because of the peripheral location, which may explain the scarcity of reports describing this vascular anomaly. The novelty of this case is further underscored by the associated presence of unilateral retinal arterial tortuosity in the ipsilateral eye. Multimodal retinal imaging including UWF ICGA and fundus autofluorescence can facilitate identification of these abnormalities, which can be complicated by the development of pigmentary alterations and even serous retinal detachment with the potential to cause vision loss.
Footnotes and Disclosures
Meira Fogel-Levin: none. Alice Wong: none. SriniVas R. Sadda is a consultant for Amgen, Allergan, Novartis, Roche/Genentech, Regeneron, Bayer, 4DMT, Astellas, Apellis, Iveric, Centervue, Heidelberg, and Optos. He has received speaker fees from Carl Zeiss Meditec, Nidek, Topcon, Optos, Heidelberg Engineering, and Novartis. He has received research instruments from Carl Zeiss Meditec, Nidek, Topcon, Optos, Heidelberg Engineering, and Centervue.. K. Bailey Freund is a consultant for Heidelberg Engineering, Zeiss, Allergan, Bayer, Genentech, and Novartis and receives research support from Genentech/Roche. David Sarraf is an advisory board member (Optovue), consultant (Amgen, Bayer Healthcare, Genentech, Novartis, Optovue, and Iveric Bio), investigator (Amgen, Genentech, Heidelberg, Optovue, and Regeneron), receiver of grants/honoraria (Amgen, Bayer Healthcare, Genentech, Iveric Bio, Novartis, Optovue, and Regeneron), speaker (Optovue), equipment receiver (Heidelberg, Optovue, and Topcon), and stock owner (Optovue).
de Silva SR
Choroidal macrovessels: multimodal imaging findings and review of the literature.
Br J Ophthalmol.2021; (bjophthalmol-2020-318095 [online ahead of print])