**Core Concept**
Snow banking is a radiological finding characterized by the accumulation of soft tissue opacity in the posterior orbit, resembling snow. This phenomenon is associated with conditions that cause inflammation and edema in the retrobulbar space.

**Why the Correct Answer is Right**
Snow banking is specifically seen in orbital pseudotumor, a form of idiopathic orbital inflammation. The inflammation leads to the accumulation of fluid and cellular debris in the retrobulbar space, causing the characteristic snow banking appearance on orbital imaging. The exact mechanism is not fully understood, but it is thought to be related to the breakdown of the blood-ocular barrier and the subsequent inflammatory response.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because snow banking is not typically associated with thyroid ophthalmopathy, which is characterized by a different set of orbital findings, including proptosis, eyelid retraction, and conjunctival chemosis.
**Option B:** This option is incorrect because orbital cellulitis is a acute infection of the orbit, which may cause orbital swelling and pain, but it is not typically associated with snow banking.
**Option C:** This option is incorrect because Graves' orbitopathy is a form of thyroid ophthalmopathy, and while it can cause orbital inflammation, it is not typically associated with snow banking.

**Clinical Pearl / High-Yield Fact**
Snow banking is a characteristic radiological finding in orbital pseudotumor, and it is essential to recognize this finding to differentiate it from other orbital conditions.

**Correct Answer:** C. Orbital pseudotumor.