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Zorluk: ZorInterpreting Imaging Results

A 24-year-old woman presents to the emergency department with sudden-onset, severe, colicky pain in her right lower quadrant that began 4 hours ago. The pain radiates to her right flank and is associated with multiple episodes of nausea and vomiting. She has no significant past medical history and takes no medications. Her temperature is 37.1°C (98.8°F), blood pressure is 118/76 mmHg, pulse is 102/min, and respiratory rate is 16/min. Physical examination reveals marked tenderness to palpation in the right adnexal region with voluntary guarding. A urine pregnancy test is negative. A transvaginal pelvic ultrasound demonstrates a unilaterally enlarged right ovary measuring 6.5 cm in maximum dimension with multiple small, peripherally displaced follicles. Spectral Doppler interrogation of the right ovary shows continuous arterial waveforms, but no venous flow is detected. A small amount of echogenic free fluid is noted in the rectouterine pouch. Which of the following is the most accurate interpretation of these imaging findings?

  1. The findings are highly suspicious for ovarian torsion because venous outflow obstruction typically precedes arterial occlusion.Cevap
  2. B
    Adnexal torsion is effectively ruled out by the presence of arterial Doppler flow, making a hemorrhagic ovarian cyst the most likely diagnosis.
  3. C
    The sonographic findings are inconclusive; an immediate contrast-enhanced computed tomography scan of the pelvis is required to visualize the vascular pedicle.
  4. D
    The presence of free fluid with these adnexal features indicates a ruptured ectopic pregnancy, requiring immediate surgical exploration.
  5. E
    The peripherally displaced follicles establish an acute complication of polycystic ovary syndrome as the primary etiology of her pain.

Cevap

The findings are highly suspicious for ovarian torsion because venous outflow obstruction typically precedes arterial occlusion.
The correct interpretation recognizes the pathophysiologic sequence of vascular compromise in ovarian torsion. Twisting of the infundibulopelvic ligament first occludes the low-pressure lymphatic and venous vessels. This causes massive ovarian edema (which peripherally displaces the follicles) and absent venous Doppler signals. The thick-walled, high-pressure arterial vessels often remain patent early in the process. Because of this, and the ovary's dual blood supply, demonstrating arterial flow on Doppler does not rule out torsion.

Adım Adım Çözüm

1
Analyze the patient's clinical presentation and preliminary laboratory results.
The patient has acute, severe, right-sided pelvic pain with nausea and vomiting. A negative pregnancy test rules out ectopic pregnancy.
Establishing the acuity and ruling out life-threatening obstetric emergencies is the first step in evaluating acute pelvic pain in a reproductive-age female.
2
Interpret the structural sonographic findings of the ovary.
The ultrasound shows an asymmetrically enlarged right ovary (6.5 cm) with peripherally displaced follicles.
These findings represent central ovarian edema pushing the follicles to the periphery, a classic morphologic sign of ovarian torsion.
3
Interpret the spectral Doppler findings based on vascular pathophysiology.
There is absent venous flow but preserved arterial flow.
When the adnexa twists, the thin-walled, low-pressure venous and lymphatic channels collapse first. The thick-walled, higher-pressure arterial system often remains patent longer. Furthermore, the ovary has a dual arterial supply (ovarian and uterine arteries), meaning arterial flow can often be detected even in confirmed cases of torsion. Thus, preserved arterial flow does not exclude the diagnosis.

Anahtar Kavram

In ovarian torsion, Doppler ultrasound typically shows absent venous flow before arterial flow is compromised due to the lower pressure in the venous system; therefore, the presence of arterial flow does not rule out the diagnosis.
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Interpreting Imaging Results

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