What causes Pseudo-kidney Sign in bowel on ultrasound?
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Answer:
Pseudo-kidney sign represents the sonographic appearance of intussusception, where invaginated bowel loops form a reniform mass with central hyperechoic fat and mucosa surrounded by a hypoechoic muscular rim; it is also seen in gastrointestinal wall thickening from malignancies like gastric or colonic adenocarcinoma.
Why is it called so?:
It is named for its reniform (kidney-like) shape on ultrasound, with a central hyperechoic region resembling renal parenchyma and sinus surrounded by a hypoechoic cortex-like rim.
Pathophysiology:
Intussusception causes telescoping of proximal bowel into distal bowel, trapping hyperechoic mesenteric fat and lumen centrally while the invaginated hypoechoic bowel wall forms the outer rim; in neoplasms, asymmetric wall thickening mimics this layered reniform pattern.
Alternative names: None
Other associated named signs: Target sign, doughnut sign, crescent-in-doughnut sign
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