TAILIEUCHUNG - Ebook Abdominal imaging: Part 2

Part 2 book “Abdominal imaging” has contents: Genitourinary system, hepatobiliary system, gynaecological disorders, miscellaneous disorders, abdominal aneurysm, abdominal hernias, common paediatric tumours – neuroblastomas, congenital renal anomalies, necrotising enterocolitis, and other contents. | Genitourinary system chapter 5 The genitourinary system consists of the renal tract and in males includes the reproductive organs such as the prostate, seminal vesicles and testes. The kidneys are responsible for filtering the blood and extracting waste products that are excreted into the urinary bladder via the ureters. Disorders of the kidneys such as cancer may produce haematuria (blood in the urine), whereas poor renal function leads to elevation of serum creatinine and urea levels. Some common diseases affecting the renal tract are urolithiasis (renal stones) and chronic renal failure. In younger patients testicular torsion may present as an emergency. US is commonly the initial imaging modality used in the evaluation of the renal tract. It is also particularly useful for evaluating the scrotal sac. CT plays an important role in diagnosis and staging of renal cancer and renal trauma.   Renal artery stenosis Renal artery stenosis (RAS) is the most common cause of secondary hypertension. It is defined as narrowing of the lumen of the renal artery and is most commonly (two thirds) caused by atherosclerotic disease. Fibromuscular dysplasia is the second most common cause of RAS. Patients usually present with very high blood pressure or acute onset of hypertension. A vascular bruit (turbulent flow noise) may be felt or heard in the flanks/abdomen. Key facts • Atheromatous plaques and calcification typically occur at the origin or within 2 cm of the origin of the renal artery from the aorta • Atheromatous RAS affects older men (usually >50 years), and is bilateral in 30% of cases 114 Genitourinary system • Fibromuscular dysplasia is an autosomal dominant disorder affecting younger patients (more often female), causing medial hyperplasia (middle layer) of the arterial wall • The area of narrowing is usually in the mid or distal renal arteries and is bilateral in two thirds of cases. Radiological findings CT or MR angiography  Along with traditional .

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