Traumatic and Toxic Retinopathies



Traumatic and Toxic Retinopathies


J. Luigi Borrillo

Carl D. Regillo



Commotio Retinae

Commotio retinae is retinal whitening that occurs after blunt ocular trauma. This transient condition affects the outer retina. Often the damage incurred to the photoreceptors is reversible.


Epidemiology



  • Statistically the condition is most common in young males.


History



  • Patients have a history of blunt ocular trauma.


Clinical Signs



  • The condition is usually asymptomatic. Decreased vision may occur with macular involvement. The retina appears whitened, while the retinal vasculature remains unaffected. The retina regains its normal appearance within weeks (Fig. 8-1). Occasionally, changes to the retinal pigment epithelium (RPE), such as stippling or clumping, may be seen after the retinal whitening resolves.


  • Be mindful of other findings seen in trauma such as hyphema or microhyphema, choroidal rupture, retinal hemorrhage, retinal dialysis, avulsed vitreous base, and vitreous hemorrhage.


Differential Diagnosis



  • Other entities that may mimic commotio retinae include branch retinal artery occlusion, white-without-pressure, and shallow retinal detachment.


Diagnostic Evaluation



  • Diagnosis is based on clinical examination.


  • Optical coherence tomography (OCT) may demonstrate increased reflectivity in areas of damaged photoreceptor outer segments.


Prognosis and Management



  • Retinal whitening resolves without visual compromise. However, permanent visual acuity loss can sometimes occur if macular retinal pigment epithelial disruption is present.







Figure 8-1. Commotio retinae. A. Commotio retinae: Outer retinal whitening in the posterior pole after blunt trauma. B. Outer retinal whitening in the peripheral retina.



Choroidal Rupture

In this injury, disruption of the choriocapillaris and Bruch’s membrane occurs secondary to traumatic ocular compression. Ruptures located in the posterior pole are concentric to the optic disc. These breaks are often associated with subretinal and subretinal pigment epithelial hemorrhage.


Epidemiology and Etiology



  • Choroidal rupture occurs as a result of trauma, most commonly in young males.


History



  • Patients have a history of blunt ocular trauma.


Clinical Signs



  • The characteristic finding is subretinal hemorrhage, with whitish, crescent-shaped lesions around the optic disc (Fig. 8-2A). In the acute setting, choroidal ruptures may be associated with other findings from blunt ocular trauma such as hyphema, iris sphincter ruptures, commotio retinae, vitreous hemorrhage, retinal tears, retinal dialysis, and orbital fractures.


  • Later, choroidal neovascularization (CNV) may occur at the edge of the rupture site (Fig. 8-2B).


Differential Diagnosis



  • Myopic lacquer cracks and angioid streaks may have a similar appearance.


  • Other causes of subretinal hemorrhage include CNV, retinal arterial macroaneurysm, Valsalva retinopathy, and anemia.


Diagnostic Evaluation



  • Diagnosis is based on clinical examination.


Prognosis and Management



  • Visual prognosis depends on the location of the choroidal rupture with respect to the fovea and any associated subretinal or subretinal pigment epithelial hemorrhage.


  • Secondary CNV can occur at anytime during the follow-up period and can cause visual acuity loss.







Figure 8-2. Choroidal rupture. A. Choroidal rupture: Crescent-shaped lesion in the macula with subretinal hemorrhage (inset). B. Chronic choroidal rupture: Yellow crescent-shaped rupture site with pigmented choroidal neovascularization (arrow) and associated subretinal fluid in the fovea.



Avulsed Vitreous Base

This entity describes separation of the vitreous base at the ora serrata that occurs secondary to trauma. Sometimes the avulsed vitreous base can be seen floating in the periphery.


Epidemiology and Etiology



  • The injury occurs as a result of trauma, usually in young males.


History



  • Patients have a history of blunt ocular trauma.


Clinical Signs



  • A semitransparent, sometimes pigmented, curvilinear ribbon-like structure may or may not be completely separated from the retinal periphery (Fig. 8-3).


  • The presence of an avulsed vitreous base is pathognomonic for ocular trauma.


  • An avulsed vitreous base may be associated with hyphema, iris sphincter tears, commotio retinae, vitreous hemorrhage, retinal tears, retinal dialysis, or orbital fractures.


Differential Diagnosis



  • Avulsed vitreous base should be distinguished from retinal dialysis.


  • Other entities that may mimic this condition include old vitreous hemorrhage.


Diagnostic Evaluation



  • Diagnosis is based on binocular indirect ophthalmoscopy with scleral depression.


Prognosis and Management



  • No treatment is necessary. Patients should be observed for the subsequent development of trauma-related ocular problems such as retinal breaks and angle-recession glaucoma.






Figure 8-3. Avulsed vitreous base. Nasal avulsed vitreous base (arrow) is pathognomonic for prior trauma.



Solar Maculopathy

Solar maculopathy is the visual loss resulting from foveal photoreceptor and retinal pigment epithelial damage as a consequence of sungazing or direct observation of a solar eclipse.


Epidemiology



  • There is a trend for higher incidence in areas where a solar eclipse was directly observable. Solar maculopathy is more common among individuals involved in sun-worshiping religious groups. Loss of the ozone layer has been associated with solar retinopathy among sunbathers in the United States.


History



  • Patients have a history of sungazing.


Clinical Signs



  • There is an abnormal foveal reflex.


  • Often, a sharply demarcated yellow or reddish spot is visible in the fovea (Fig. 8-4).


  • Retinal pigment epithelial changes (focal hyperpigmentation) may be evident in the foveal or parafoveal area at later stages.


Differential Diagnosis



  • Pseudomacular hole, photic maculopathy, and macular dystrophy or degeneration may have a similar appearance.


Diagnostic Evaluation



  • Diagnosis is based on clinical examination.


  • Fluorescein angiography will reveal nonspecific retinal pigment epithelial window defects centered on the fovea.


  • OCT may demonstrate disruption of foveal inner and outer photoreceptor segments.


Prognosis and Management



  • Good visual recovery occurs in most patients, but it may take weeks or months for vision to improve.


  • No treatment is needed.







Figure 8-4. Solar retinopathy. A. Color fundus photograph demonstrating deep yellow foveal lesion (inset). Solar retinopathy. B. Corresponding fluorescein angiogram photograph demonstrating foveal window defect. C. Acute solar retinopathy with yellow foveal lesion and hemorrhage. Visual acuity is 20/30. (B, Courtesy of Dr. Alexander J. Brucker.)



Valsalva Retinopathy

In Valsalva retinopathy, unilateral or bilateral retinal or preretinal hemorrhage occurs as a result of an acute episode of increased intrathoracic pressure. Superficial capillaries rupture secondary to a sharp rise in ocular intravenous pressure.


Epidemiology



  • The condition can occur in persons of any age.


History



  • Patients usually have a history of recent strenuous physical exertion, coughing, vomiting, or straining (e.g., with constipation).


Clinical Signs



  • Single or multiple intraretinal hemorrhages (often underneath the internal limiting membrane) are noted in the posterior pole (Fig. 8-5). There may be a decrease in visual acuity when the hemorrhage is localized in or over the foveal region.


  • Subconjunctival hemorrhage may be associated with this condition. Significant vitreous hemorrhage is rare.


Differential Diagnosis



  • Retinal macroaneurysm, diabetic retinopathy, venous occlusion, anemia, anticoagulant therapy, retinal tear, or posterior vitreous detachment with associated hemorrhage may mimic the findings of Valsalva retinopathy.


Diagnostic Evaluation



  • Diagnosis is based on clinical examination.


  • B-scan ultrasonography is performed to evaluate for underlying retinal detachment or retinal tear in the setting of dense vitreous hemorrhage.


  • OCT may demonstrate hemorrhage underneath reflective signal of the internal limiting membrane.


Prognosis and Management



  • The visual prognosis is good.


  • Management consists of observation, only, in most cases. Hemorrhages will resolve spontaneously.


  • Vitrectomy may be considered for nonclearing vitreous hemorrhage (but is rarely indicated).







Figure 8-5. Valsalva retinopathy. Multiple superficial retinal hemorrhages in the macula.



Shaken Baby Syndrome

This condition refers to intraocular hemorrhages in infants or young children secondary to child abuse. The findings are associated with decreased visual acuity and increased mortality.


Epidemiology



  • The condition is most common in infants and toddlers.


History



  • Recently, often multiple episodes of violent shaking of the infant precede findings, although it is often difficult to obtain a history of abuse from the caretaker. Caretakers may refuse diagnostic evaluation.


Clinical Signs



  • Subretinal, intraretinal, or preretinal hemorrhages are noted in one or (more commonly) both eyes (Fig. 8-6A). The preretinal hemorrhages are typically globular as opposed to flat (Fig. 8-6B). Other signs include poor visual or pupillary response. No single ocular finding is pathognomonic.


  • Ecchymosis, long bone and rib fractures, lethargy, or developmental delay are common associated findings. Often the child has physical findings that do not match the reported mechanism of the injuries.


Differential Diagnosis



  • Birth trauma: Intraretinal hemorrhages may be seen in newborns, especially with the use of forceps in the delivery. These hemorrhages resolve over the course of weeks and are often not associated with neurologic sequelae.


  • Leukemia and intraocular infections may also mimic the ocular findings of shaken baby syndrome.


Diagnostic Evaluation

Jul 14, 2016 | Posted by in OPHTHALMOLOGY | Comments Off on Traumatic and Toxic Retinopathies

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