Kamla, age 48 yrs, presents with unilateral mild axial proptosis. There is no redness or pain. Investigation of choice is –
**Core Concept**
The underlying principle being tested involves the diagnosis of orbital pathologies, specifically those causing **axial proptosis**, which refers to the forward displacement of the globe of the eye. This condition can result from various causes, including thyroid ophthalmopathy, orbital tumors, and vascular anomalies.
**Why the Correct Answer is Right**
Given the clinical presentation of unilateral mild axial proptosis without redness or pain, the most likely diagnosis would involve conditions such as thyroid ophthalmopathy or orbital tumors. The investigation of choice for such conditions, especially when looking for detailed orbital anatomy and potential involvement of surrounding structures, would typically involve imaging.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is not provided, so we cannot assess its correctness.
**Option B:** Similarly, this option is missing.
**Option C:** Without the option text, it's challenging to determine why it's incorrect.
**Option D:** This option is also not available for evaluation.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that when evaluating proptosis, it's crucial to differentiate between axial and non-axial (or eccentric) proptosis, as this can help narrow down the differential diagnosis. Axial proptosis suggests involvement of the orbit behind the globe, such as with thyroid eye disease or orbital tumors.
**Correct Answer:** Unfortunately, without the provided answer choices, the correct answer cannot be directly stated. However, typically for unilateral mild axial proptosis, an **MRI or CT scan of the orbits** would be a common investigation of choice to evaluate the orbital anatomy and potential pathologies.