**Question:** A 20 year old male presents with scrotal mass. The first investigation to be done is

A. Ultrasonography
B. Computed Tomography (CT) scan
C. Chest X-ray
D. Magnetic Resonance Imaging (MRI)

**Correct Answer:** .

**Core Concept:** Scrotal masses in young males are a concern for testicular pathology as the testes are the most common site for testicular neoplasms. A careful clinical examination is essential, as a palpable scrotal mass can be an indicator of testicular torsion (rotation of the testis, obstructing blood flow) which requires urgent surgical intervention.

**Why the Correct Answer is Right:** Ultrasonography (USG) is the initial imaging modality of choice for evaluating scrotal masses due to its non-invasive nature, cost-effectiveness, and ability to visualize the testes and epididymis in real-time. USG can assess the size, contour, echogenicity, and vascularity of the mass, as well as the testicular volume and position.

**Why Each Wrong Option is Incorrect:**

**A.** Computed Tomography (CT) scan: Although CT scan provides high-resolution images and can detect calcifications, it is not the first-line investigation for scrotal masses as it exposes the patient to radiation and is more expensive than USG.

**B.** Chest X-ray: A chest X-ray is irrelevant in evaluating a scrotal mass as it only visualizes the thorax and lungs.

**C.** Magnetic Resonance Imaging (MRI): MRI provides high-resolution images, but it is costlier and more time-consuming than USG, and is not always readily available in resource-limited settings.

**Clinical Pearl:** In cases where ultrasound is inconclusive, MRI can be considered. However, for a general examination, USG is the preferred initial modality.

**Explanation:**

In this scenario, a scrotal mass in a young male patient raises concerns about testicular pathology, which necessitates prompt investigation. Amongst the given options, ultrasonography (USG) is the most suitable initial investigation for evaluating scrotal masses due to its non-invasive nature, cost-effectiveness, and real-time imaging capabilities. CT scan, Chest X-ray, and MRI are either radiation-exposing or more expensive or both, making them less preferable options in this context.

**Core Concept:** Ultrasonography is a safe, non-invasive, and cost-effective imaging modality for evaluating testicular masses. It can assess the size, shape, echogenicity, and vascularity of the mass, as well as the testicular volume and position.

**Why Each Wrong Option is Incorrect:**

**A.** Computed Tomography (CT) scan: CT scan exposes the patient to ionizing radiation and is more expensive than USG. It is not the first-line investigation for scrotal masses due to its exposure to ionizing radiation and associated costs.