What's the most likely diagnosis?
- 34 year-old male with RLQ pain
Axial CT image of pelvis
- Ovarian cyst
- CSFoma
- Renal cell carcinoma
- Aortic aneurysm
- Appendicitis
Additional Image - Frontal chest radiograph
Additional Image
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Frontal chest radiograph
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Answer:
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2. CSFoma (Peritoneal Cerebrospinal Fluid Pseudocyst)
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CSFoma
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
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