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 Table of Contents  
REVIEW ARTICLE
Year : 2017  |  Volume : 20  |  Issue : 2  |  Page : 122-126

Choroidal metastasis: A review of literature


Department of Radiation Oncology, VMMC and Safdarjung Hospital, New Delhi, India

Date of Web Publication14-Nov-2017

Correspondence Address:
Deepti Sharma
Room No. 271, 2nd Floor, New OPD Block, VMMC and Safdarjung Hospital, New Delhi - 110 029
India
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DOI: 10.4103/1119-0388.218213

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  Abstract 

Choroidal metastasis is a significant clinical problem in patients with metastatic cancer owing to abundant vascular supply. The two most common cancers leading to choroidal metastases are breast cancer followed by lung cancer. The treatment of choroidal metastasis depends on the status of primary disease, number, and location of choroidal metastasis, symptomatology and the general condition of the patient. A number of options are available for the therapy of ocular metastasis, including observation, chemotherapy, photocoagulation, cryosurgery, surgical resection, or radiotherapy. A database search was conducted on Google scholar and PubMed using phrase words, using the terms “choroidal metastasis,” in combination with terms such as “treatment,” “features,” or “diagnosis.” References of all publication were also searched. All relevant publications were collected, reviewed, and analyzed.

Keywords: Choroidal metastasis, eye, radiotherapy, systemic disease


How to cite this article:
Sharma D. Choroidal metastasis: A review of literature. Trop J Med Res 2017;20:122-6

How to cite this URL:
Sharma D. Choroidal metastasis: A review of literature. Trop J Med Res [serial online] 2017 [cited 2017 Nov 18];20:122-6. Available from: http://www.tjmrjournal.org/text.asp?2017/20/2/122/218213


  Introduction Top


Earlier, metastatic cancer to the eye, especially choroidal metastasis was considered a rare phenomenon. The first case of choroidal metastasis was reported by Perls in 1872.[1] In a study by Godtfredsen, only 0.07% of patients were reported with choroidal metastasis.[2] Choroidal metastases are now considered the most common intraocular malignancy in the adult population. In a review of patients dying from the malignancy, 8% displayed choroidal metastases on autopsy.[3] Choroidal metastases tend to become apparent late in the course of malignancy and are associated with disseminated disease and poor prognosis.[1],[3],[4],[5] and therefore, choroidal metastasis should be suspected in a patient complaining of decrease or loss of vision. In this article, we will review the common primary tumor origins, the salient features of metastases, and treatment options available for these lesions.

A database search was conducted on Google scholar and PubMed using phrase words, using the terms “choroidal metastasis,” in combination with terms such as “treatment,” “features,” or “diagnosis.” References of all publication were also searched. All relevant publications were collected, reviewed, and analyzed in detail to summarized in this paper.


  Epidemiology and Etiopathogenesis Top


The most common site for intraocular metastasis is uveal tract (choroidal metastasis accounts for 88% of cases followed by iris and ciliary body). The potential reason for such metastasis is the high vascular supply of the uveal tract.[4],[5],[6],[7] The choroid provides a vascular avenue for tumor emboli to sequester and allows an environment receptive to growth.[7]

The first two most common causes of choroidal metastasis are breast carcinoma followed by lung cancer.[4],[5],[8],[9] Other less common primary tumors causing choroidal metastases are carcinoma of the gastrointestinal tract (4%), prostate (2%), kidney (2%–4%), and skin (2%).[4],[5],[10] Tumors arising from the submandibular gland, thyroid, contralateral choroid, testes, ovaries, urothelial tract, neuroendocrine tumor, and sarcoma are few rare causes for choroidal metastasis.[5],[7],[10],[11],[12],[13],[14],[15],[16] Studies had shown that in about 34% of cases, choroidal metastasis appear before the diagnosis of systemic cancer. Of those without known cancer, the primary tumor sites included lung cancer (7%), breast cancer (35%), and about 50% of patients with the primary site not found.[5]


  Presentation and Diagnosis Top


The majority of symptomatic patients note a decreased visual acuity at the time of presentation. Other presenting signs or symptoms include diplopia, photophobia, ptosis, blepharitis, metamorphopsia, pain, flashes and floaters, mass lesion, uveitis, exophthalmos, secondary glaucoma, and detached retina.[4],[5],[17] Bilateral choroidal metastasis is also common. It varies from 19% to 31% in different studies.[4],[5],[18]

The presence of metastatic disease to the eye is obviously high in the differential diagnosis of ocular lesions when a primary cancer is present elsewhere. Other conditions can be mistaken for metastatic disease; therefore, a careful evaluation is necessary for a correct diagnosis. The differential diagnosis includes amelanotic nevus, amelanotic melanoma, choroidal hemangioma, posterior scleritis, choroidal osteoma, retinitis, hemorrhage, choroiditis, rhegmatogenous retinal detachment, reactive lymphoid hyperplasia, lymphoma, Harada's disease, uveal effusion syndrome, and central serous chorioretinopathy.[19]

The diagnosis of ocular metastases is based primarily on clinical findings supplemented by imaging studies. The choroidal metastases usually appear as solid, flat, plaque-like, mottled, and yellow-brown lesions.[20] A number of ancillary ophthalmologic procedures can assist in the diagnosis of metastatic tumors. These procedures include autofluorescence (AF), ultrasonography, fluorescein angiography (FA), tomography/magnetic resonance imaging (MRI), fine-needle aspiration biopsy.[21]


  Autofluorescence Top


AF is a noninvasive imaging technique, used to define tumor surface characteristics and to delineate progressing tumor margins.[22],[23] Fundus autofluorescence photography relies on the stimulated emission of light from naturally occurring fluorophores, the most significant being lipofuscin.[24] On ophthalmoscopic examination, choroidal metastases often have overlying subretinal fluid and lipofuscin that typically appear as scattered clumps of brown pigment.[22],[23]


  Ultrasonography Top


Ultrasonography determines tumor dimensions and echogenicity and allows differentiation of metastases from other intraocular neoplasms, particularly melanomas. On B-scan ultrasound, metastatic tumors tend to be acoustically solid convex masses with a lower silhouette, that is, lower height-to-base ratios than malignant melanoma. A-scan ultrasound shows moderate internal reflectivity compared with melanoma, which is usually low.[25]

Shields et al. also demonstrated that thickness tends to correlate to origin of metastases, example a mean thickness of metastases secondary to melanoma measuring 1 mm, breast 2 mm, lung and prostate 3 mm, and gastrointestinal and kidney measuring 4 mm.[5]


  Optical Coherence Tomography Top


Optical coherence tomography (OCT) is analogous to ultrasound imaging, except that it uses light instead of sound allows evaluation of secondary retinal-retinal pigment epithelial changes. In addition, the technique is useful in the follow-up of lesions after treatment.[26] Enhanced depth imaging OCT also allows detection of micrometastases often inapparent with fundoscopy.[27]


  Fluorescein Angiography Top


FA can provide ancillary data necessary to differentiate choroidal metastases from choroidal melanomas. FA typically displays a hypofluorescent pattern in early arterial phases, with hyperfluoresence in the late venous phases, later than most choroidal melanomas.[23],[28] Choroidal metastases also contain dilated retinal capillaries with a pinpoint leakage at the tumor border in 73% of cases as compared to melanoma in 16% of cases.[29]


  Magnetic Resonance Imaging Top


Computed tomography and MRI have a limited role in the diagnosis of ocular metastasis.[21] Nevertheless, brain imaging is useful before initiation of radiotherapy to rule out metastasis or extension to central nervous system (CNS). Mewis and Young reported that 22% of patients diagnosed with choroidal metastasis had a concurrent diagnosis of CNS metastasis.[18] An additional 19% of patients had a subsequent diagnosis. MRI often shows a well-demarcated choroidal mass that appears isointense on T1-weighted images and hypointense on T2-weighted images.[30],[31]


  Fine Needle Aspiration Biopsy Top


In cases of unidentified primary source and indeterminate diagnostic findings, fine-needle aspiration biopsy can provide cytological evidence of metastasis versus primary occurrence.[32]


  Treatment Top


The treatment of choroidal metastasis depends on the status of primary disease, number and location of choroidal metastasis, symptomatology and the general condition of the patient. A patient with an asymptomatic metastasis with poor general condition does not require therapy. On the other hand, a symptomatic patient with controlled systemic disease should receive therapy to prevent further deterioration in vision. A number of options are available depending on disease status such as chemotherapy, photocoagulation, cryosurgery, surgical resection, or radiotherapy.


  Systemic Treatment Top


Systemic treatment depends on the type of primary cancer. Fenestrated endothelium in the choriocapillaris allows entry of medications into the choroidal tumors to provide effective tumor control.[5] Studies have shown the expression of estrogen and progesterone receptors in choroidal metastasis making therapy with tamoxifen and aromatase inhibitors effective.[33],[34] Regression of choroidal metastasis from breast and lung carcinoma after systemic chemotherapy has been noted.[35],[36]


  External Beam Radiotherapy Top


External beam radiotherapy (EBRT) at a dosage of 40–60 Gy causes tumor regression in 85%–93% of patients with vision improvement or stabilization in 56% of eyes.[37],[38],[39] However, no consensus about the adequate dose and technique of radiation therapy has been reached yet. In patients with uncontrolled primary, the approach is usually palliative. Rudoler et al. reported a multivariate analysis of 188 patients treated with EBRT for choroidal metastasis.[40] The median total dose of radiotherapy was 36 Gy with a range of 30–40 Gy in 2–3 Gy fractions. Ninety-three percent of patients remained free of clinically evident recurrent disease at last follow-up, with a 98% rate of globe preservation. In another study by Roy et al. short course palliative radiation therapy of 30 Gy in 10 # is an effective modality for the management of choroidal metastasis in patients of carcinoma breast.[41]


  Radiosurgery Top


Gamma knife radiosurgery (GKR) and cyberknife radiosurgery both have been used in the treatment of uveal melanomas as well as choroidal metastases.[39],[42],[43] Two reports have documented the success of GKR with choroidal metastases, with the larger study comprised 57 eyes, documenting 100% control in Grade 1 lesions and 63% response in all choroidal metastases overall, over a mean follow-up of 7 months.[39],[44]


  Proton Beam Radiotherapy Top


Proton beam radiotherapy (PBT) allows for more focused irradiation, as compared to GKR, PBT, used for the treatment of uveal melanomas has recently been applied to choroidal metastases as well.[45],[46] In a retrospective study of 76 eyes treated with PBT, complete regression was observed in 84% within 5 months with no recurrence after a mean follow-up of 10 months. Associated serous retinal detachments resolved in 82% of patients within 3.8 months.[47]


  Plaque Radiotherapy Top


Plaque brachytherapy permits radiation to be delivered directly to the choroidal lesion and has been used successfully for choroidal melanomas and more recently, for solitary choroidal metastasis. In one retrospective study of 36 patients, lesion regression was noted in 94% of patients at a mean follow-up of 11 months.[48] Complications were seen in 8% of patients and included radiation retinopathy, papillopathy, and cataract in anteriorly placed plaques.


  Transpupillary Thermotherapy Top


Transpupillary thermotherapy (TTT) uses diode laser to administer heat to the choroid and retinal pigment epithelium, inducing tumor necrosis.[4] The technique was first used as an adjuvant therapy for choroidal melanoma incompletely responsive to plaque radiotherapy.[49] Expansion of the technique into other intraocular tumors has led to the treatment of choroidal metastases.[50],[51] In a study of 59 eyes with choroidal metastasis managed with TTT as the primary treatment, 71% of eyes showed regression or inhibition of growth, whereas 7% showed progression over a follow-up of 15 months.[50]


  Photodynamic Therapy Top


Photodynamic therapy causes tumor necrosis through the production of reactive singlet oxygen, as well intravascular thrombosis and subsequent tumor infarction through verteporfin. Kaliki et al. documented tumor regression in 7 of 9 patients, with stable or improved vision in all but one case over an average follow-up of 17 months.[52]


  Intravitreal Anti-Vascular Endothelial Growth Factor Injection Top


Intravitreal anti-vascular endothelial growth factor injections have redirected the management of neovascular ocular conditions. With the dependence of metastases on neovascularization for growth, the use of intravitreal bevacizumab and ranibizumab to prevent angiogenesis is an effective modality of treatment.[53],[54],[55]


  Survival and Follow-Up Top


In general, survival is limited after the diagnosis of ocular metastasis. Ferry and Font noted a median survival of 7.4 months.[4] Other authors have noted similar median survival rates of 5–32 months.[4],[5],[20],[37]


  Conclusion Top


Choroidal metastasis is a significant but under-recognized clinical problem, frequently occurring in the later stages of disseminated disease and is considered a poor prognostic sign. Effective control of these lesions is imperative. Systemic chemotherapy allows tumor control in some cases, whereas focal therapy is advised in tumors causing visual loss or is unresponsive to systemic treatment.

Acknowledgments

I acknowledge the help of my family, especially my angel Avishi for providing time and support.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
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  In this article
Abstract
Introduction
Epidemiology and...
Presentation and...
Autofluorescence
Ultrasonography
Optical Coherenc...
Fluorescein Angi...
Magnetic Resonan...
Fine Needle Aspi...
Treatment
Systemic Treatment
External Beam Ra...
Radiosurgery
Proton Beam Radi...
Plaque Radiotherapy
Transpupillary T...
Photodynamic Therapy
Intravitreal Ant...
Survival and Fol...
Conclusion
References

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