**Question:** Pseudoproptosis caused by-

A. Proptosis
B. Enlarged orbital contents
C. Thyroid eye disease
D. Orbital fracture

**Core Concept:** Pseudoproptosis is a clinical sign characterized by an apparent protrusion of the eyeball. It is a result of increased orbital volume due to the presence of enlarged orbital contents, which can be caused by various conditions.

**Why the Correct Answer is Right:** In this case, the correct answer (B) is related to the increased orbital volume caused by the presence of enlarged orbital contents. Enlarged orbital contents may result from various conditions, including orbital trauma (D), thyroid eye disease (C), and orbital tumors (not mentioned here).

**Why Each Wrong Option is Incorrect:**

A. Proptosis (D) is a clinical sign characterized by the actual protrusion of the eyeball and does not explain pseudoproptosis.

B. Enlarged orbital contents (B) result in pseudoproptosis, as discussed above.

C. Thyroid eye disease (C) is a cause of proptosis, not pseudoproptosis.

D. Orbital fracture (D) can cause proptosis, not pseudoproptosis, as it results in the actual protrusion of the eyeball.

**Clinical Pearl:** Pseudoproptosis is a crucial clinical sign to recognize as it indicates the presence of increased orbital volume and requires further evaluation to determine the underlying cause. This may involve history-taking, clinical examination, and, if necessary, imaging studies like ultrasound, CT scans, or MRI to identify the underlying condition.

**Correct Answer:** B. Enlarged orbital contents