Bullous retinal detachment is characterised by which retinal configuration?

Smooth, convex, dome-shaped elevation without breaks The neurosensory retina is elevated in a smooth, highly convex, mobile configuration by subretinal fluid, giving the characteristic bullous appearance.

Concave immobile detachment with a horseshoe tear

Shallow detachment with fixed folds from traction

Localised detachment bounded by pigmented demarcation lines

What is the central mechanism of bullous retinal detachment?

Excess subretinal fluid from leakage or impaired resorption Breakdown of the outer blood-retinal barrier at the RPE, increased choroidal permeability and reduced RPE pump function allow fluid to accumulate beneath the retina.

Vitreous traction pulling the retina anteriorly

Fluid passing through a peripheral retinal break

Contraction of a fibrovascular epiretinal membrane

Why does subretinal fluid shift with head position in bullous retinal detachment?

No retinal break is present to fix the fluid Because there is no retinal break, the exudative fluid gravitates freely and the detachment shifts as the head moves.

Vitreous traction anchors the retina posteriorly

The subretinal fluid is viscous and haemorrhagic

The retina remains adherent at the ora serrata

Which condition is a recognised inflammatory cause of bullous retinal detachment?

Vogt-Koyanagi-Harada disease Inflammatory causes include Vogt-Koyanagi-Harada disease and posterior scleritis, alongside choroidal tumours, hypertensive choroidopathy and preeclampsia.

Lattice degeneration with atrophic holes

Acute posterior vitreous detachment

What does fluorescein angiography typically show in bullous retinal detachment?

Late pooling of dye without leakage from breaks Late pooling of dye with no leakage from a retinal break supports an exudative rather than a rhegmatogenous mechanism.

Early blocked fluorescence with a dark centre

Widespread peripheral capillary non-perfusion

Segmental staining of the retinal arterioles

What role does B-scan ultrasonography play in bullous retinal detachment?

Detecting underlying choroidal pathology B-scan is essential for detecting choroidal thickening or a mass and helps separate exudative from tractional causes.

Measuring central corneal thickness

Quantifying anterior chamber inflammation

Mapping retinal nerve fibre layer loss

Which finding is the key feature separating bullous from rhegmatogenous retinal detachment?

Absence of any retinal break Identifying that no retinal break is present is the key diagnostic feature and prevents unnecessary retinal surgery.

Pigment granules within the anterior vitreous

Inferior location of the detached retina

Markedly reduced intraocular pressure

What is the primary management principle in bullous retinal detachment?

Treating the underlying causative condition Management targets the underlying cause with corticosteroids, anti-VEGF, tumour-directed therapy or systemic control rather than retinal surgery.

Immediate scleral buckling of the detached retina

Prompt pars plana vitrectomy with tamponade

Laser retinopexy around the detached area

When is surgical retinal reattachment indicated in bullous retinal detachment?

If a secondary rhegmatogenous detachment develops Surgery is generally not indicated unless a secondary rhegmatogenous detachment supervenes.

As soon as the macula becomes involved

Once subretinal fluid shifts with head position

When hard exudates appear near the fovea

Which factors determine visual prognosis in bullous retinal detachment?

Duration, macular involvement and underlying cause Early recognition and treatment of the primary cause allow significant recovery, while chronic detachment causes permanent photoreceptor damage.

Axial length, lens status and refractive error

Patient age, sex and reported family history

Intraocular pressure, cup-disc ratio and pachymetry

Bullous Retinal Detachment: Causes, Diagnosis, and Management

Case Study

A 58-year-old male presented to the retina clinic with a 2-week history of progressive, painless visual loss in his left eye.

He described a dark shadow spreading from the inferior visual field upward, associated with mild metamorphopsia. There was no history of ocular trauma or prior retinal surgery.

His medical history was notable for poorly controlled hypertension and a recent diagnosis of choroidal melanoma in the same eye, for which he was under systemic evaluation.

Examination Results:

Visual Acuity: 20/25 in the right eye and counting fingers at 2 meters in the left eye
Anterior Segment: Unremarkable in both eyes
Fundus Examination: Smooth, dome-shaped elevation of the neurosensory retina involving the posterior pole without retinal breaks
Optical Coherence Tomography (OCT): Extensive subretinal fluid with an intact but elevated neurosensory retina
B-scan Ultrasonography: Choroidal thickening with associated exudative retinal detachment
Fluorescein Angiography: Late pooling of dye without evidence of retinal tears

A diagnosis of Bullous Retinal Detachment secondary to choroidal pathology was established.

Disease Entity

Bullous retinal detachment refers to a form of retinal detachment characterized by a smooth, convex, and often rapidly progressive elevation of the neurosensory retina due to the accumulation of subretinal fluid.

Unlike rhegmatogenous retinal detachment, bullous retinal detachment typically occurs without retinal breaks and is most commonly associated with exudative or tractional mechanisms.

The detachment often appears highly elevated, mobile, and dome-shaped, giving it the characteristic “bullous” configuration.

This type of detachment is frequently linked to inflammatory, vascular, neoplastic, or systemic conditions that disrupt the balance of fluid movement across the retinal pigment epithelium (RPE).

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Pathophysiology

The pathophysiology of bullous retinal detachment centers on excessive accumulation of subretinal fluid due to impaired resorption or increased leakage.

Key mechanisms include:

Breakdown of the outer blood-retinal barrier at the level of the RPE
Increased choroidal vascular permeability
Inflammatory or neoplastic infiltration of the choroid
Reduced RPE pump function

In exudative bullous detachments, fluid originates primarily from the choroidal circulation rather than the vitreous cavity.

Conditions such as uveal tumors, inflammatory choroiditis, or systemic vascular disorders increase hydrostatic pressure or permeability, allowing fluid to accumulate beneath the retina.

Because no retinal break is present, the detachment often shifts with changes in head position.

Epidemiology

Bullous retinal detachment is not a distinct disease but rather a clinical manifestation seen in various ocular and systemic disorders.

It may occur at any age, depending on the underlying cause. Inflammatory causes are more common in younger patients, while neoplastic and vascular etiologies predominate in older adults.

The true incidence is difficult to quantify due to its heterogeneous causes and frequent misclassification as rhegmatogenous retinal detachment in early stages.

Etiology

Common causes of bullous retinal detachment include:

Choroidal tumors: Choroidal melanoma, hemangioma, metastasis
Inflammatory diseases: Vogt–Koyanagi–Harada disease, posterior scleritis
Vascular disorders: Severe hypertensive choroidopathy, preeclampsia
Infectious conditions: Posterior uveitis, choroiditis
Idiopathic causes: Central serous chorioretinopathy variants

Recognition of the underlying etiology is essential for appropriate management.

Clinical Features

Patients with bullous retinal detachment commonly present with:

Rapid or subacute vision loss
Visual field defects described as shadows or curtains
Metamorphopsia
Reduced contrast sensitivity

Pain is usually absent unless associated with inflammatory causes such as posterior scleritis.

On examination, the retina appears smooth, elevated, and mobile, often shifting with eye or head movement.

Examination Findings

Fundus Examination:

Smooth, convex retinal elevation
Absence of retinal tears or holes
Possible underlying choroidal mass or inflammation

Optical Coherence Tomography (OCT):

Large amounts of subretinal fluid
Intact neurosensory retina
Possible RPE irregularities

Fluorescein Angiography:

Late pooling of dye
Absence of leakage from retinal breaks

B-scan Ultrasonography:

Essential for detecting choroidal pathology
Helps differentiate exudative from tractional causes

Differential Diagnosis

Bullous retinal detachment must be differentiated from:

Rhegmatogenous retinal detachment
Tractional retinal detachment
Central serous chorioretinopathy
Choroidal effusion
Suprachoroidal hemorrhage

Careful imaging and examination are critical to avoid unnecessary surgical intervention.

Diagnosis

Diagnosis is based on:

Detailed fundus examination
Multimodal imaging, including OCT, FFA, and B-scan ultrasound
Systemic evaluation when indicated

Identifying the absence of retinal breaks is a key diagnostic feature.

Management

Management of bullous retinal detachment focuses on treating the underlying cause rather than immediate retinal surgery.

Treatment options include:

Corticosteroids: Systemic or local for inflammatory causes
Anti-VEGF therapy: In selected vascular conditions
Tumor-directed therapy: Radiotherapy or systemic oncology management
Systemic control: Blood pressure management, treatment of systemic disease

Surgical retinal reattachment is generally not indicated unless secondary rhegmatogenous detachment develops.

Prognosis

Visual prognosis depends largely on:

Duration of detachment
Involvement of the macula
Underlying etiology

Early recognition and treatment of the primary cause can lead to significant visual recovery. Chronic bullous detachments may result in permanent photoreceptor damage and visual loss.

Prevention

Prevention focuses on:

Early detection of systemic and ocular diseases
Prompt referral to retina specialists
Regular follow-up for high-risk patients

Effective systemic disease control plays a crucial role in reducing recurrence.

Conclusion

Bullous retinal detachment is a distinctive clinical presentation that reflects underlying choroidal or systemic pathology rather than a primary retinal break.

Accurate diagnosis, careful differentiation from other types of retinal detachment, and targeted management of the underlying cause are essential to preserve vision and avoid unnecessary surgical intervention.

References

Ryan SJ, Schachat AP, Wilkinson CP. Retina. Elsevier.
Shields CL, Shields JA. Choroidal tumors and exudative retinal detachment. Survey of Ophthalmology.
Gass JD. Differential diagnosis of retinal detachment. American Journal of Ophthalmology.
Spaide RF. Diseases of the choroid and exudative retinal detachment. Retina.

Test yourself

A few questions straight from this article.

1 / 10 0 correct

Bullous retinal detachment is characterised by which retinal configuration?
The neurosensory retina is elevated in a smooth, highly convex, mobile configuration by subretinal fluid, giving the characteristic bullous appearance.
What is the central mechanism of bullous retinal detachment?
Breakdown of the outer blood-retinal barrier at the RPE, increased choroidal permeability and reduced RPE pump function allow fluid to accumulate beneath the retina.
Why does subretinal fluid shift with head position in bullous retinal detachment?
Because there is no retinal break, the exudative fluid gravitates freely and the detachment shifts as the head moves.
Which condition is a recognised inflammatory cause of bullous retinal detachment?
Inflammatory causes include Vogt-Koyanagi-Harada disease and posterior scleritis, alongside choroidal tumours, hypertensive choroidopathy and preeclampsia.
What does fluorescein angiography typically show in bullous retinal detachment?
Late pooling of dye with no leakage from a retinal break supports an exudative rather than a rhegmatogenous mechanism.
What role does B-scan ultrasonography play in bullous retinal detachment?
B-scan is essential for detecting choroidal thickening or a mass and helps separate exudative from tractional causes.
Which finding is the key feature separating bullous from rhegmatogenous retinal detachment?
Identifying that no retinal break is present is the key diagnostic feature and prevents unnecessary retinal surgery.
What is the primary management principle in bullous retinal detachment?
Management targets the underlying cause with corticosteroids, anti-VEGF, tumour-directed therapy or systemic control rather than retinal surgery.
When is surgical retinal reattachment indicated in bullous retinal detachment?
Surgery is generally not indicated unless a secondary rhegmatogenous detachment supervenes.
Which factors determine visual prognosis in bullous retinal detachment?
Early recognition and treatment of the primary cause allow significant recovery, while chronic detachment causes permanent photoreceptor damage.