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Zorluk: OrtaOrdering Imaging Studies

A 55-year-old man presents to his primary care physician reporting a single episode of red-colored urine yesterday. He denies any flank pain, dysuria, urinary frequency, fever, or trauma. His medical history is notable for a 35 pack-year smoking history, and he worked as an industrial painter for 20 years. His blood pressure is 135/85 mmHg, and heart rate is 78/min. Physical examination, including a digital rectal examination, is unremarkable. Urinalysis reveals 60 red blood cells per high-power field, 1-2 white blood cells per high-power field, and no leukocyte esterase or nitrites. Serum creatinine is 1.0 mg/dL. He is referred to a urologist for cystoscopy. Which of the following is the most appropriate imaging study to complete the diagnostic evaluation of this patient?

  1. A
    Renal ultrasound
  2. Computed tomography (CT) urographyCevap
  3. C
    Non-contrast computed tomography (CT) of the abdomen and pelvis
  4. D
    Magnetic resonance (MR) urography without contrast
  5. E
    Positron emission tomography (PET) scan

Cevap

Computed tomography (CT) urography
The patient presents with painless gross hematuria and possesses significant risk factors for urothelial malignancy, including age over 35, a substantial smoking history, and occupational exposure to industrial paints (aniline dyes). The standard evaluation for suspected urinary tract malignancy consists of cystoscopy to evaluate the bladder and lower urinary tract, combined with dedicated upper tract imaging. Computed tomography (CT) urography is the gold standard imaging modality for the upper urinary tract in this setting. It provides a non-contrast phase to detect calculi, a contrast-enhanced nephrographic phase to detect renal parenchymal masses, and a delayed excretory phase to visualize the urothelium of the renal pelvis and ureters.

Adım Adım Çözüm

1
Identify the patient's primary symptom and associated risk factors.
The patient has painless gross hematuria with high-risk features for urothelial malignancy, specifically age over 35, heavy smoking history, and occupational exposure to aniline dyes.
Risk stratification dictates the urgency and comprehensiveness of the urologic evaluation.
2
Determine the required diagnostic workup for high-risk gross hematuria.
Guidelines mandate visualization of both the lower urinary tract (via cystoscopy) and the upper urinary tract (via cross-sectional imaging).
Urothelial carcinoma can occur anywhere along the urinary tract epithelium, from the renal calyces to the bladder.
3
Select the optimal imaging modality for the upper urinary tract.
Computed tomography (CT) urography is selected as the most appropriate study.
CT urography includes multi-phasic imaging (non-contrast, nephrographic, and excretory phases) offering the highest sensitivity and specificity for both renal parenchymal masses and upper tract urothelial carcinoma.

Anahtar Kavram

Evaluation of high-risk painless gross hematuria requires complete urinary tract visualization, utilizing cystoscopy for the lower tract and CT urography for the upper tract.
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