Multimodal imaging of combined hamartoma of the retina and retinal pigment epithelium associated with an acquired vitelliform lesion
© Chae et al. 2015
Received: 7 October 2015
Accepted: 5 November 2015
Published: 7 December 2015
We present a case of a combined hamartoma of the retina and retinal pigment epithelium associated with a subfoveal acquired vitelliform lesion induced by vitreomacular traction. The purpose of this report is to present a unifying hypothesis of these concurrent findings, as aided by multimodal imaging.
A 25-year-old white man presented with a 6-month history of a visual disturbance in his left eye. At presentation, ophthalmic assessment showed a combined hamartoma adjacent to his optic nerve that had caused marked corrugation within the inner retinal surface. An acquired vitelliform lesion was present in the macula with an associated epiretinal membrane as demonstrated on spectral-domain optical coherence tomography. Optical coherence tomography angiography corroborated the clinical diagnosis of combined hamartoma.
We are not aware of previous cases of a combined hamartoma associated with an acquired vitelliform lesion. As previously proposed in acquired vitelliform lesions related to epiretinal membrane and vitreoretinal traction, we believe that macular tractional forces might interfere with retinal pigment epithelium phagocytosis of shed outer segments, leading to the occurrence of this acquired vitelliform lesion.
KeywordsOptical coherence tomography angiogram Combined hamartoma Vitelliform lesion Vitreo-macular traction
Combined hamartoma of the retina and retinal pigment epithelium (henceforth referred to as combined hamartoma) was first described by Gass, in 1973, as an uncommon tumor in a series of seven patients . He characterized these intraocular tumors in terms of thickened retinal tissue with a hyperpigmented tumor base and often presenting with contractions at the inner retinal surface . He also concluded that they were congenital. Hisopathologically, combined hamartomas have been described as conglomerations of disorganized retinal, glial and vascular tissue intertwined with tubules of retinal pigment epithelium (RPE) with reduplication of the normally singular RPE layer [2, 3]. Several case reports have documented the association of these lesions with concurrent intraocular or systemic comorbidities such as neurofibromatosis types II and I [4–6], branchio-oculofacial syndrome , Gorlin-Goltz syndrome , Poland abnormality  and juvenile nasopharyngeal angiofibroma .
In the largest studied series of combined hamartomas (79 eyes from a single institution) Shields et al. found that common clinical characteristics included intralesional corkscrew vessels (65 %), retinal traction (81 %), and epiretinal membrane (61 %) . According to Shields et al., the time-domain optical coherence tomography findings of combined hamartomas were most notable for dense epiretinal membranes leading to significant vitreoretinal traction with eventual retinal thickening and disorganization over the tumor itself . Novel imaging techniques such as spectral-domain optical coherence tomography (SD-OCT) have allowed for better delineation of tumor tissue composition over the vitreoretinal interface. For instance, using enhanced depth imaging optic coherence tomography, Arepalli et al. described the presence of epiretinal membrane with traction in a sawtooth or folded pattern at the vitreoretinal interface . While epiretinal membranes are known to occur commonly with combined hamartomas, we report a unique presentation of a combined hamartoma concurring with an acquired vitelliform lesion (AVL) in the macula, secondary to tractional forces. We further describe the intrinsic vascular pattern of a combined hamartoma using optical coherence tomography angiography (OCTA).
SD-OCT through the tumor showed thickening and disorganization of the inner and outer retina with marked saw-tooth like corrugations along the vitreoretinal interface (Fig. 1). The subfoveal vitelliform lesion appeared hyperreflective with preservation of the external limiting membrane and ellipsoid layer at the site of the lesion. SD-OCT also revealed the presence of an epiretinal membrane with contraction of the inner retinal layers of the macula.
Similar to the description of combined hamartomas by Gass in 1973 , our patient presented with a unilateral grey lesion that was slightly elevated, involving the RPE, retina and the overlying vitreous which extended in a fan-like projection towards the periphery and blended imperceptibly with the surrounding tissue. After the initial identification of combined hamartomas by Gass, many other studies have documented common manifestations observed with these tumors, including a study by Shields et al. . In a similar study of 60 patients, combined hamartomas are described as having vascular tortuosity (93 %), pigmentation (87 %), elevation (80 %), vitreoretinal interface disturbances (78 %), and lipid exudation (7 %) .
These observed clinical characteristics are confirmed and further elaborated with the aid of multimodal imaging, including novel techniques such as OCTA, which allowed for depiction of the tumor’s vasculature without the need for intravenous dye injection and without the limits in resolution arising from extravasation of fluorescein dye . OCTA confirms and topographically maps out the increased and seemingly disorganized vasculature in the tumor as previously described [3, 14]. While the presence of thickened glial and retinal tissue makes it difficult to view the vascular architecture on fundoscopic examination, OCTA isolates and enables clear visualization of the vascular network.
Our patient manifested many of the characteristics mentioned above. However, he presented uniquely with a subfoveal acquired vitelliform lesion in the setting of traction occurring at the vitreoretinal interface. Acquired vitelliform lesions are known to occur in tractional maculopathies in which significant vitreomacular traction is present [16, 17]. For instance, in a study of 87 patients with unilateral epiretinal membrane, a subfoveal vitelliform lesion was found in 15 patients (17.2 %) compared to only 5 patients (5.7 %) in matched control fellow eyes (p = 0.03) . According to Freund et al., normal apposition between the photoreceptor tips and the RPE is disrupted by tractional forces which can interfere with phagocytosis of shed outer segments in the RPE . Subsequent accumulation of lipid-laden macrophages and RPE cells may account for the yellow vitelliform collection which appears hyperreflective on SD-OCT . The common natural progression of AVLs is gradual absorption of the lesion with subsequent atrophy or, in rare cases, formation of a macular hole; both scenarios lead to poor visual outcomes [18–20].
A combined hamartoma can cause visual impairment in several ways, but vision loss most commonly occurs when retinal dragging causes foveal distortion [11, 14, 21]. When significant visual impairment is observed secondary to fovea-involving traction, treatment options include surgery to relieve the vitreomacular tractional component. Surgical management, however, remains controversial, as previous reports documenting visual improvement following vitrectomy and membrane peeling are anecdotal [22–25]. While combined hamartoma is a benign tumor, macular edema and choroidal neovascularization (CNV) can occur in association with these lesions, which can lead to a poor visual outcome . Treatment of CNV in the past has included photodynamic therapy and laser photocoagulation but, more recently, intravitreal antiangiogenic injections have been utilized [27, 28].
Diffuse retinal folds seen emanating from the tumor and extending over the macula indicate the presence of significant macular contraction where the subfoveal vitelliform lesion lies. SD-OCT served as a diagnostic adjunct to further localize the area of traction occurring along the vitreoretinal interface as evidenced by the presence inner retinal corrugations with an overlying epiretinal membrane. AVLs have been noted to occur in tractional maculopathies caused by epiretinal membranes, and we believe that the tractional forces described above resulted in the formation of an AVL in our patient. We additionally attribute the epiretinal gliosis and subsequent traction on the inner retinal vessels to have caused the linear retinal hemorrhage seen in the superior macula.
Both combined hamartomas and AVLs are capable of compromising vision if the integrity of the ellipsoid is compromised, either through direct traction or due to late outer retinal changes often seen in acquired vitelliform lesions. Despite the significant retinal striations and contraction seen in our patient, his foveal architecture remained generally undisturbed with relative sparing of the outer retinal landmarks accounting for his preserved visual acuity. Furthermore, as our patient did not exhibit any evidence of edema or CNV in association with the combined hamartoma, there was no rationale for the use of anti-inflammatory agents or antiangiogenic injections. Given these findings and the lack of consistent favorable outcomes after surgical intervention, close observation was recommended to the patient.
In summary, the advent of novel imaging modalities including SD-OCT has allowed for detailed characterization of combined hamartomas, particularly at the vitreoretinal interface. We are not aware of previously published OCTA imaging of combined hamartomas, which, in our patient, revealed features of the tumor’s microvascular morphology hitherto only seen in histopathological studies.
Written informed consent was obtained from the patient for publication of this Case report and any accompanying images.
retinal pigment epithelium
acquired vitelliform lesion
spectral-domain optical coherence tomography
optical coherence tomography angiography
BC acquisition of data, conceptualization of manuscript, review of literature, drafting/editing of the report. ED-G acquisition of data, conceptualization of manuscript, editing of report, review of literature, drafting/editing of the report, preparation of image panels. KKD acquisition of data, editing of report, preparation of image panels. WL acquisition of data, editing of report, preparation of image panels. KBF Conceptualization of manuscript, editing the report, analysis and interpretation of images. LAY conceptualization of manuscript, editing the report, analysis and interpretation of images. All authors read and approved the final manuscript.
Bora Chae received her BS in psychobiology at University of California Los Angeles and her MD at Boston University School of Medicine. She completed her transitional year internship at Santa Clara Valley Medical Center in San Jose, California and is now currently in her final year of residency in Ophthalmology at New York University School of Medicine/Manhattan Eye, Ear, and Throat Hospital as Chief Resident.
Elona Dhrami-Gavazi received her medical degree at the University of Tirana, Albania. She completed Ophthalmology residency training in Albania after which she completed a second Ophthalmology residency training at Columbia University in New York. She is currently a vitreoretinal fellow at Columbia University, Vitreous Retina-Macula Consultants of New York and Manhattan Eye Ear Throat Hospital, New York. She is a recipient of the Victor A. McCusick Research Fellowship Grant from the National Marfan Foundation.
Kunal K. Dansingani studied medicine at Cambridge and at the Royal Free Hospital and UCL Medical School, London. He completed postgraduate training in Ophthalmology in the UK, through the Royal College of Ophthalmologists, London, and fellowships in medical and surgical retina at Moorfields Eye Hospital, where he then held a faculty position for 2 years as a locum consultant in vitreo-retinal surgery. He is currently spending a research sabbatical as an international fellow with the Vitreous Retina Macula Consultants of New York. His special interests include management of complex medical and surgical retinal disease, surgical instruction, and retinal imaging.
Winston Lee received his master’s degree from Columbia University and is currently a graduate research assistant at the Department of Ophthalmology, Columbia University Medical Center.
K. Bailey Freund is a Clinical Professor of Ophthalmology at New York University School of Medicine and a senior partner at Vitreous Retina Macula Consultants of New York. He is on the Editorial Board of the journal Retina. He has authored over 225 peer-reviewed scientific manuscripts and numerous book chapters. He is a recipient of the Young Investigator Award from the Macula Society.
Lawrence Yannuzzi is founder of VRMNY as well as vice-chairman and director of the LuEsther T. Mertz Retinal Research Center of the Manhattan Eye, Ear & Throat Hospital and the founder and president of The Macula Foundation, Inc. He has published over 400 scientific papers and 13 books and is the recipient of numerous awards, including an honorary doctorate by the University of Ancona, the Michelson Award for Retinal Vascular Disease, a Distinguished Alumnus Award by Boston University, the Henkind, Gass, and Patz Medals by The Macula Society, the Alcon Research Award, the Herman Wacker Award of the Club Jules Gonin, the Arthur J. Bedelle Award, the Retinal Research Award and the Gass Medal of the Retina Society, the Bietti Medal, the Pisart Award from the Lighthouse International, and the Lifetime Achievement Award by the American Academy of Ophthalmology.
Financial support LuEsther T. Mertz Retinal Research Center, Manhattan Eye, Ear and Throat Hospital, New York, NY, USA, and The Macula Foundation, Inc., New York, NY, USA. The funding organizations had no role in the design or conduct of this research.
Financial disclosures K. Bailey Freund: Genentech: Consultant, ThromboGenics: Consultant, Ohr Pharmaceutical: Consultant, Bayer HealthCare: Consultant, Heidelberg Engineering: Consultant. There are no other relevant disclosures.
L. A. Yannuzzi: Genentech: Honorarium for directing an educational program. There are no other relevant disclosures.
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