Snow banking is typically seen in-
**Core Concept**
Snow banking is a characteristic radiological finding associated with a specific type of glaucoma. It refers to the accumulation of fibrovascular tissue and debris in the supraciliary space, which can lead to elevated intraocular pressure (IOP). This phenomenon is closely related to the pathophysiology of glaucoma, particularly in conditions where the trabecular meshwork is compromised.
**Why the Correct Answer is Right**
Snow banking occurs in conditions with high IOP and compromised trabecular meshwork, such as neovascular glaucoma (NVG). In NVG, ischemia of the iris and ciliary body leads to the formation of new blood vessels, which can obstruct the trabecular meshwork and cause a significant increase in IOP. The fibrovascular tissue and debris accumulate in the supraciliary space, giving rise to snow banking. The supraciliary space is a potential pathway for aqueous humor drainage, and its obstruction leads to increased IOP.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because snow banking is not typically associated with open-angle glaucoma, which is a more common form of glaucoma characterized by a gradual increase in IOP due to impaired trabecular meshwork function.
**Option B:** This option is incorrect because snow banking is not a characteristic finding in angle-closure glaucoma, which is typically associated with a sudden increase in IOP due to the blockage of the trabecular meshwork by the iris.
**Option C:** This option is incorrect because snow banking is not a characteristic finding in normal-tension glaucoma, which is a form of glaucoma characterized by progressive optic neuropathy despite normal IOP.
**Clinical Pearl / High-Yield Fact**
Snow banking is a red flag for neovascular glaucoma, which can lead to severe vision loss if not promptly treated. Early recognition of snow banking on imaging studies can prompt further evaluation and management to prevent vision loss.
**Correct Answer: D. Neovascular Glaucoma.**