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Difficulty: MediumNormal Pregnancy and Prenatal Care

A 26-year-old woman, gravida 2, para 1, at 24 weeks gestation presents to the clinic with a 2-day history of mild right-sided flank discomfort. She denies dysuria, urinary frequency, hematuria, fever, chills, or vaginal bleeding. Her temperature is 37.1 °C (98.8 °F), blood pressure is 112/70 mm Hg, pulse is 82/min, and respiratory rate is 14/min. Physical examination reveals a gravid uterus consistent with gestational age and mild right costovertebral angle tenderness. Fetal heart tones are 145/min. Urinalysis shows no white blood cells, red blood cells, leukocyte esterase, or nitrites. A comprehensive metabolic panel is within normal limits. A renal ultrasound demonstrates mild dilation of the right renal pelvis and proximal ureter without evidence of nephrolithiasis. Which of the following is the most appropriate next step in management?

  1. Reassurance and routine prenatal careAnswer
  2. B
    Intravenous ceftriaxone
  3. C
    Ureteral stent placement
  4. D
    Noncontrast CT scan of the abdomen and pelvis
  5. E
    Measurement of 24-hour urine protein

Answer

Reassurance and routine prenatal care
The correct answer is reassurance and routine prenatal care because the patient's presentation is highly consistent with physiologic hydronephrosis of pregnancy. During normal pregnancy, high levels of progesterone cause smooth muscle relaxation, leading to ureteral dilation. Additionally, the growing gravid uterus typically undergoes dextrorotation, which preferentially compresses the right ureter at the pelvic brim. This results in mild to moderate right-sided hydronephrosis and hydroureter, a finding observed in up to 80% of pregnant women. In the absence of fever, dysuria, pyuria, or nephrolithiasis on imaging, this is considered a benign physiologic change that requires no further workup or intervention.

Step-by-Step Solution

1
Analyze the patient's symptoms and vital signs.
The patient has mild right flank discomfort but no fever, dysuria, hematuria, or abnormal vital signs.
To rule out acute life-threatening or urgent conditions like pyelonephritis or severe preeclampsia.
2
Interpret the laboratory and imaging findings.
Urinalysis is completely negative, ruling out urinary tract infection. Ultrasound shows right-sided hydronephrosis without stones.
To distinguish between true obstructive uropathy/infection and normal physiologic changes of pregnancy.
3
Synthesize findings to formulate a diagnosis and management plan.
The findings represent physiologic hydronephrosis of pregnancy, which requires only reassurance.
Recognizing this benign condition prevents unnecessary and potentially harmful interventions.

Key Concept

Physiologic hydronephrosis is a normal adaptation during pregnancy, most prominent on the right side, requiring no intervention in the absence of infection or true obstruction.
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Topics

Normal Pregnancy and Prenatal Care

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