Subependymal calcified nodules are seen in –
**Core Concept**
The question is testing knowledge of **neuroimaging** and **neuropathology**, specifically the appearance of **subependymal calcified nodules** in certain conditions. These nodules are typically seen on **computed tomography (CT) scans** or **magnetic resonance imaging (MRI)**.
**Why the Correct Answer is Right**
Subependymal calcified nodules are characteristic of **tuberous sclerosis complex (TSC)**, a genetic disorder that affects multiple organ systems. In TSC, these nodules form due to the abnormal growth of **hamartias**, which are benign tumors that can calcify over time. The **mTOR pathway** is dysregulated in TSC, leading to the development of these lesions.
**Why Each Wrong Option is Incorrect**
**Option A:** Not specified, but typically would be an incorrect condition.
**Option B:** Not specified, but would not be associated with subependymal calcified nodules.
**Option C:** Not specified, but likely an incorrect choice.
**Option D:** Not specified, but probably not the correct answer.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **subependymal giant cell astrocytomas (SEGAs)** are also associated with TSC and can appear as calcified lesions near the **foramen of Monro**.
**Correct Answer:** D. Tuberous Sclerosis.