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What Is Malignant Glaucoma?

Malignant glaucoma, also called aqueous misdirection syndrome, is a rare form of secondary angle closure glaucoma in which aqueous humor is misdirected into or behind the vitreous body. This shift pushes the lens iris diaphragm forward, leading to a uniformly shallow or flat anterior chamber and raised intraocular pressure. It most often develops after intraocular surgery in eyes with angle closure tendencies. Without prompt treatment, pressure related damage to the optic nerve can progress quickly. The condition is considered an urgent complication that needs specialist care.

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What Is Malignant Glaucoma?

Malignant glaucoma, also called aqueous misdirection syndrome, is a rare form of secondary angle closure glaucoma in which aqueous humor is misdirected into or behind the vitreous body. This shift pushes the lens iris diaphragm forward, leading to a uniformly shallow or flat anterior chamber and raised intraocular pressure. It most often develops after intraocular surgery in eyes with angle closure tendencies. Without prompt treatment, pressure related damage to the optic nerve can progress quickly. The condition is considered an urgent complication that needs specialist care.

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Pathophysiology and Risk Factors

In malignant glaucoma, aqueous humor flows posteriorly instead of moving from the posterior chamber through the pupil into the anterior chamber. Fluid trapped within or behind the vitreous increases posterior segment volume and moves the lens iris diaphragm forward, closing the angle. Risk factors include prior angle closure glaucoma, small crowded eyes, and recent filtering or cataract surgery. Laser procedures in narrow angle eyes can also precede episodes. The exact trigger for misdirection is not fully understood but involves changes in ciliary body and vitreous relationships.

Clinical Presentation and Examination Findings

Patients often present with eye pain, decreased vision, and headache after recent surgery or laser treatment. On examination, intraocular pressure is high, yet the anterior chamber is shallow both centrally and peripherally. Gonioscopy shows angle closure that does not resolve with standard iridotomy. The lens iris diaphragm appears displaced forward, and there may be corneal edema from high pressure. The fellow eye often shows anatomic risk factors such as narrow angles or short axial length.

How Is Malignant Glaucoma Diagnosed?

Diagnosis is based on the combination of high intraocular pressure, uniformly shallow anterior chamber, and recent intraocular procedure in an eye with angle closure anatomy. It is important to distinguish malignant glaucoma from pupillary block, where a patent iridotomy usually deepens the chamber. Ultrasound biomicroscopy or anterior segment optical coherence tomography can document forward displacement of the lens iris diaphragm and ciliary body changes. Careful evaluation rules out suprachoroidal hemorrhage or effusion, which can also shallow the chamber.

Management and Prognosis

Initial treatment uses cycloplegic agents, aqueous suppressants, and sometimes hyperosmotic agents to shift the lens iris diaphragm backward and reduce misdirection. If medical therapy does not succeed, laser disruption of the anterior hyaloid face through a patent iridotomy or surgical vitrectomy with zonulectomy and iridectomy is considered to create a new aqueous pathway. In pseudophakic eyes, pars plana vitrectomy often plays a central role. Prognosis depends on how quickly the condition is recognized and treated and on preexisting optic nerve damage. Lifelong monitoring is needed, as affected eyes carry higher long term glaucoma risk.

FAQs About Malignant Glaucoma

Is malignant glaucoma a cancer?

No, the term malignant refers to the aggressive course and difficult management rather than a tumor. It is a severe form of glaucoma related to fluid misdirection.

Can malignant glaucoma occur without surgery?

Most cases follow intraocular surgery or laser in eyes with narrow angles, but rare spontaneous cases have been reported in highly hyperopic eyes with crowded anatomy.

Why does a standard iridotomy not cure malignant glaucoma?

In malignant glaucoma, the main problem is misdirection of aqueous into or behind the vitreous, not simple pupillary block. A patent iridotomy does not correct that pathway on its own.

Will I lose vision if I have malignant glaucoma?

The risk of vision loss is real if pressure stays high, so rapid recognition and treatment are important. With timely care, many patients retain useful vision, though close follow up is required.