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Mesothelial pelvic lymph node inclusions mimicking metastatic thyroid carcinoma
D E Cohn1, A L Folpe, A M Gown
1Department of Obstetrics and Gynecology, University of Washington Medical Center, Seattle 98195, USA.
Gynecologic Oncology
|March 26, 1998
Summary
Benign mesothelial inclusions in pelvic lymph nodes can mimic metastatic disease in gynecologic cancer patients. Immunocytochemistry is crucial for distinguishing these benign inclusions from malignant tumors.
Area of Science:
- Gynecologic Oncology
- Surgical Pathology
- Immunohistochemistry
Background:
- Benign lymph node inclusions are frequently observed in gynecologic cancer surgery.
- These inclusions can be mistaken for metastatic disease, complicating diagnosis.
- Struma ovarii is a rare ovarian teratoma containing thyroid tissue.
Observation:
- A 52-year-old woman with ascites and a complex adnexal mass was diagnosed with struma ovarii.
- Pelvic lymph nodes showed mesothelial inclusions suspicious for metastasis.
- Immunocytochemistry confirmed the inclusions were benign mesothelial cells, not metastatic carcinoma.
Findings:
- This case highlights benign mesothelial lymph node inclusions in nodal sinuses.
- Such inclusions are potential mimics of metastatic carcinoma.
- Their presence in pelvic lymph nodes is a novel finding.
Implications:
- Accurate differentiation of benign inclusions from metastasis is critical for patient management.
- Immunocytochemical evaluation is essential for correct diagnosis.
- This finding expands the differential diagnosis for lymph node pathology in gynecologic oncology.