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138. Frage
Which arterial branches lie at the base of the renal pyramids?
Antwort: C
Begründung:
The arcuate arteries are located at the corticomedullary junction, arching over the base of the renal pyramids.
They form as the interlobar arteries reach the boundary between the cortex and medulla. The arcuate arteries give rise to the interlobular arteries, which supply the renal cortex.
* Segmental arteries (A) branch directly from the renal artery.
* Interlobar arteries (B) course between the renal pyramids.
* Interlobular arteries (D) extend into the cortex from the arcuate arteries.
Reference Extracts:
* Moore KL, Dalley AF, Agur AM. Clinically Oriented Anatomy. 7th ed. Lippincott Williams & Wilkins, 2013.
* Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.
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139. Frage
Which finding is most likely demonstrated in these images of a hypertensive patient with a history of hematuria?
Antwort: C
Begründung:
The ultrasound images show a heterogeneous, solid-appearing mass within the right kidney. The patient has a history of hypertension and hematuria-classic clinical features that raise suspicion for renal cell carcinoma (RCC), especially in an adult.
Renal cell carcinoma is the most common primary malignant tumor of the kidney in adults. Common presenting symptoms include:
* Hematuria (most frequent symptom)
* Flank pain
* Palpable abdominal mass
* Hypertension (due to increased renin secretion)
* Sometimes paraneoplastic syndromes (e.g., polycythemia due to erythropoietin production) Ultrasound Features of RCC:
* Solid renal mass, often with heterogeneous echotexture
* May contain cystic components, calcifications, or necrotic areas
* May distort the renal contour
* Doppler may show internal vascularity
Differentiation from other options:
* B. Adenoma: Rare and typically small, benign cortical lesions. They do not typically present with hematuria or hypertension and cannot be reliably distinguished from RCC on ultrasound.
* C. Nephroblastoma (Wilms tumor): Pediatric renal tumor seen almost exclusively in children under age
5.
* D. Pheochromocytoma: Arises from the adrenal gland (not the kidney); associated with hypertension but not hematuria.
References:
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th Edition. Elsevier, 2018.
Chapter: Urinary Tract, pp. 210-222.
American College of Radiology (ACR) Appropriateness Criteria - Hematuria, 2022.
Radiopaedia.org. Renal cell carcinoma: https://radiopaedia.org/articles/renal-cell-carcinoma
140. Frage
Which is the most common pancreatic cancer?
Antwort: B
Begründung:
Pancreatic ductal adenocarcinoma is by far the most common pancreatic malignancy, accounting for approximately 85-90% of pancreatic cancers. It typically arises from the exocrine portion of the pancreas, most frequently in the pancreatic head. Islet cell (neuroendocrine) tumors and cystic neoplasms (e.g., mucinous cystadenocarcinoma) are far less common.
According to Rumack's Diagnostic Ultrasound:
"Adenocarcinoma is the most common malignant neoplasm of the pancreas, representing the vast majority of pancreatic cancers." Reference:
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound. 5th ed. Elsevier, 2017.
WHO Classification of Digestive System Tumors, 5th ed., IARC, 2019.
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141. Frage
Which vessel is most likely to display hepatofugal flow in the presence of portal hypertension?
Antwort: B
Begründung:
The coronary vein (left gastric vein) is a common collateral pathway in portal hypertension. It often becomes dilated and may demonstrate hepatofugal (reversed) flow as blood diverts from the high-pressure portal system into systemic collaterals.
According to Zwiebel's Introduction to Vascular Ultrasound:
"The left gastric (coronary) vein is a frequent site of hepatofugal flow in portal hypertension, reflecting collateral development." Reference:
Zwiebel WJ, Pellerito JS. Introduction to Vascular Ultrasound. 6th ed. Elsevier, 2019.
AIUM Practice Parameter for Portal Venous Doppler Ultrasound, 2020.
142. Frage
Which finding is most likely demonstrated in this abdominal wall image of a patient with a history of atrial fibrillation?
Antwort: D
Begründung:
The ultrasound image demonstrates a complex, heterogeneous hypoechoic collection within the abdominal wall, with mixed echogenicity and ill-defined margins. The lesion appears to contain internal debris but lacks definitive signs of vascularity or air (which would be seen in an abscess). There is no peristalsis, herniated bowel, or fat to suggest hernia.
Given the history of atrial fibrillation - a condition commonly treated with anticoagulation therapy (e.g., warfarin, apixaban) - this clinical background raises high suspicion for a rectus sheath or abdominal wall hematoma.
Key ultrasound features of hematomas:
* Early (acute): hyperechoic or heterogeneous
* Chronic/resolving: complex or cystic with fluid-debris levels
* No internal vascularity on Doppler
* May be confined to muscle or fascial planes
This is consistent with a hematoma, particularly in patients on anticoagulation therapy.
Comparison of answer choices:
* A. Hernia - typically shows bowel or fat with movement/peristalsis passing through a fascial defect.
* B. Lipoma - usually homogeneous and echogenic, not complex or fluid-filled.
* C. Abscess - often presents as a complex fluid collection with peripheral hyperemia and possibly air, plus systemic signs of infection.
* D. Hematoma - Correct. The image and clinical history (anticoagulation due to atrial fibrillation) strongly support this diagnosis.
References:
Berman L, et al. Sonographic appearance and evolution of rectus sheath hematomas. AJR Am J Roentgenol.
1996.
Rumack CM, Wilson SR, Charboneau JW, Levine D. Diagnostic Ultrasound, 5th ed. Elsevier; 2017.
AIUM Practice Parameter for the Performance of Diagnostic Ultrasound Examinations of the Abdomen and Retroperitoneum (2020).
143. Frage
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