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Case of the Week 348

What's the most likely diagnosis?

  • 34 year-old male with RLQ pain

Axial CT image of pelvis

  1. Ovarian cyst
  2. CSFoma
  3. Renal cell carcinoma
  4. Aortic aneurysm
  5. Appendicitis

Additional Image - Frontal chest radiograph


Additional Image



Frontal chest radiograph




2. CSFoma (Peritoneal Cerebrospinal Fluid Pseudocyst)



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General Considerations

  • Loculation of cerebrospinal fluid (CSF) at the distal end of the a ventriculoperitoneal shunt tube
  • May occur secondary to adhesions
  • Leads to an enlarging abdominal and/or pelvic mass at catheter tip
  • CSF from tip is no longer absorbed by peritoneum

    More ...


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