Pass the ARDMS RDMS AB-Abdomen Questions and answers with ValidTests

Direct inguinal hernias protrude through Hesselbach's triangle, which lies medial to the inferior epigastric artery. In contrast, indirect inguinal hernias pass lateral to the inferior epigastric artery via the deep inguinal ring.

According to Moore’s Clinically Oriented Anatomy:

“Direct inguinal hernias occur medial to the inferior epigastric vessels, within Hesselbach's triangle.”

On ultrasound, tendons appear as cord-like hyperechoic structures with linear fibrillar echotexture when imaged in long axis. The fibrils are highly reflective, creating the typical hyperechoic appearance. Posterior shadowing is not typical unless there is calcification.

According to Rumack’s Diagnostic Ultrasound:

“Tendons have a highly organized hyperechoic linear fibrillar pattern when examined along their long axis.”

Littoral cell angioma is a rare, benign vascular tumor of the spleen, arising from the littoral cells lining the splenic sinusoids. In contrast, lymphoma, metastasis, and angiosarcoma are malignant splenic neoplasms.

According to WHO Classification and Rumack’s Diagnostic Ultrasound:

“Littoral cell angioma is a rare benign vascular neoplasm of the spleen with characteristic imaging findings.”

The ultrasound image demonstrates a classic example of ascites, shown by the anechoic (dark) fluid located between bowel loops or surrounding abdominal organs. In this case, there appears to be a small fluid collection in the peritoneal cavity.

One of the key maneuvers used to differentiate free fluid (such as ascites) from loculated fluid or other structures is to reposition the patient. Asking the patient to “turn from side to side” (Option D) can help in assessing whether the fluid shifts position — a hallmark feature of free intraperitoneal fluid. This positional change is highly useful in confirming the diagnosis and distinguishing ascites from other potential mimics (e.g., cystic masses, lymphoceles, or bowel wall thickening).

In contrast:

Drinking water (A) is often used in imaging the urinary bladder or gastrointestinal tract but not for fluid characterization.

Standing upright (B) may shift fluid but is less practical during real-time ultrasound.

Breathing quietly (C) doesn’t significantly aid in visualizing peritoneal fluid mobility.

The superior mesenteric vein (SMV) lies directly anterior to the uncinate process of the pancreas. The uncinate process wraps around the posterior aspect of the SMV and SMA. The portal vein and IVC lie more posteriorly in relation to the pancreatic head.

According to Moore’s Clinically Oriented Anatomy:

“The superior mesenteric vein crosses anterior to the uncinate process of the pancreas.”

Graded compression technique is the gold standard for ultrasound evaluation of the appendix. It displaces gas and compresses overlying bowel loops to visualize the noncompressible, blind-ending tubular appendix directly at the point of maximal tenderness.

According to Rumack’s Diagnostic Ultrasound:

“Graded compression using steady, increasing pressure displaces gas and bowel to optimize visualization of the appendix.”

Addison disease (primary adrenal insufficiency) results in insufficient production of cortisol and aldosterone. The hallmark laboratory findings include:

Hyponatremia (low sodium)

Hyperkalemia (high potassium)

Elevated liver enzymes (due to nonspecific hepatic involvement)

Fatigue, weight loss, and hypotension are common clinical features.

Conn syndrome (B) causes hyperaldosteronism, leading to hypokalemia (not hyperkalemia).

Acute pancreatitis (C) would typically show elevated amylase/lipase.

Hepatocellular carcinoma (D) may present with elevated liver enzymes but not the electrolyte pattern described.

Reference Extracts:

Nieman LK. "Diagnosis and Treatment of Primary Adrenal Insufficiency." J Clin Endocrinol Metab. 2011;96(7):1957-1966.

Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.

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When the sample volume (gate) is too large, it captures signals from both the vessel and surrounding tissues or adjacent flows. This leads to a broadening of the spectral waveform and produces "spectral noise" or "spectral broadening," reducing the accuracy of velocity measurements and waveform analysis. Aliasing results from high velocity relative to the Nyquist limit, not from gate size.

According to Zwiebel’s Introduction to Vascular Ultrasound:

“Increasing the sample volume beyond the vessel size causes spectral broadening, resulting in spectral noise and inaccurate Doppler measurements.”

In percutaneous procedures such as biopsies or drainages, maintaining a sterile field is critical to avoid introducing infection. While the transducer is covered by a sterile cover, the gel placed inside this cover (between the probe and the cover) must also be sterile, as it contacts the sterile field. The transducer itself and machine controls are not sterile but are handled appropriately to avoid field contamination.

According to the AIUM Guidelines:

"Sterile coupling gel must be used inside the sterile probe cover during all invasive or percutaneous procedures." (AIUM Guidelines for Cleaning and Preparing Ultrasound Transducers, 2021).

An ultrasound of a fetus AI-generated content may be incorrect.

The ultrasound image shows a transverse (axial) view of the fetal abdomen. Notably, there is abnormal continuity of renal parenchyma across the midline anterior to the aorta, forming a U- or horseshoe-shaped structure. This is characteristic of a congenital anomaly known as a horseshoe kidney.

Horseshoe kidney is the most common fusion anomaly of the kidneys, occurring in approximately 1 in 400–600 live births. It results from fusion of the lower poles of both kidneys during fetal development. On prenatal ultrasound, this anomaly can be suspected when the kidneys appear closer to the midline than usual and are connected by an isthmus of renal tissue or fibrous band that crosses anterior to the spine and great vessels.

Typical sonographic findings include:

Abnormally located kidneys, often lower than expected

Renal fusion across the midline (usually at the lower poles)

Possible associated hydronephrosis or malrotation

Comparison to other anomalies:

This is not consistent with polycystic kidney disease (which would show diffusely echogenic kidneys with poor corticomedullary differentiation).

Duplex kidney would show duplicated collecting systems but not fusion across the midline.

Renal agenesis would demonstrate absence of renal tissue.

Posterior urethral valves would show a distended bladder with bilateral hydronephrosis, not midline fusion.