Pseudo-Meigs Syndrome vs. Meigs Syndrome
Yes, pseudo-Meigs syndrome is essentially "Meigs but with malignant ovarian cancer" – it presents with the same triad of ovarian tumor, ascites, and pleural effusion, but the ovarian tumor is malignant rather than benign.
Key Distinction
Meigs syndrome is defined as:
- Benign ovarian tumor (typically fibroma, thecoma, or Brenner tumor)
- Ascites
- Pleural effusion
- Complete resolution of ascites and pleural effusion after tumor removal 1, 2
Pseudo-Meigs syndrome is defined as:
- Malignant ovarian tumor (primary ovarian carcinoma or metastatic disease to the ovary)
- Ascites and/or pleural effusion
- Resolution or improvement of effusions after tumor removal 3, 4, 5
Critical Clinical Points
Staging Implications
When a malignant ovarian tumor presents with pleural effusion, this automatically classifies the disease as FIGO Stage IV if the pleural fluid cytology is positive for malignant cells 6, 7, 6, 7, 8. However, in true pseudo-Meigs syndrome, the pleural fluid and ascites are typically negative for malignant cells despite the presence of malignancy 4, 5, 9, 10.
The Diagnostic Challenge
The presence of ascites, pleural effusion, and elevated CA-125 with an ovarian mass strongly suggests malignancy 1, 11. This creates a diagnostic dilemma because:
- If cytology is positive → Stage IV ovarian cancer (not pseudo-Meigs)
- If cytology is negative → Could be pseudo-Meigs syndrome with malignant tumor
Common Pitfall
Do not assume all pleural effusions and ascites with ovarian malignancy represent peritoneal/pleural metastases. In pseudo-Meigs syndrome, these effusions resolve after oophorectomy because they result from the tumor's mechanical or hormonal effects rather than direct metastatic spread 3, 4, 5, 9.
Clinical Significance
Pseudo-Meigs syndrome most commonly occurs with:
- Primary ovarian carcinomas (particularly serous carcinoma) 3
- Krukenberg tumors (metastatic disease to ovary, especially from gastric or colorectal cancer) 4, 5, 9
Surgical removal of the ovarian tumor leads to rapid resolution of ascites and pleural effusion in both Meigs and pseudo-Meigs syndromes 3, 4, 5, 9, 10. This distinguishes pseudo-Meigs from true Stage IV disease with malignant effusions, where fluid would persist or recur after surgery.
Bottom Line
The term "pseudo-Meigs" acknowledges that while the clinical presentation mimics Meigs syndrome (benign tumor with effusions), the underlying pathology is malignant. The key is that the effusions are not due to malignant seeding but rather to the tumor's presence, which is why they resolve with tumor removal.