Thyroid metastasis from ovarian clear cell carcinoma

Area of Science:

• Oncology
• Pathology

Background:

• Ovarian clear cell carcinoma is a rare gynecologic malignancy.
• Metastasis of ovarian carcinoma to the thyroid gland is exceptionally uncommon.

Purpose of the Study:

• To report a rare case of ovarian clear cell carcinoma metastasis to the thyroid gland.
• To emphasize the diagnostic utility of immunohistochemistry in differentiating thyroid metastases from primary thyroid neoplasms.

Main Methods:

• Histopathological examination of thyroid nodule and lymph node.
• Immunohistochemical analysis using markers including cytokeratin AE1/AE3, hepatocyte nuclear factor-1-beta, PAX8, thyroglobulin, and thyroid transcription factor-1.

Main Results:

• The patient presented with cervical pain, a thyroid nodule, and cervical lymphadenopathy.
• Immunohistochemistry confirmed thyroid metastasis from ovarian clear cell carcinoma (positive for HNF-1β, PAX8; negative for TTF-1, thyroglobulin).
• The patient's condition progressed, leading to death from stroke secondary to Trousseau's syndrome.

Conclusions:

• Thyroid metastasis from ovarian clear cell carcinoma is a rare clinical entity.
• Immunohistochemistry is crucial for accurate diagnosis in suspected metastatic disease to the thyroid.
• Early recognition and management are vital, though prognosis can be poor.