Ectopic Thyroid Papillary Carcinoma with Cervical Lymph Node Metastasis as the Initial Presentation, Accompanied by...

Area of Science:

• Endocrinology
• Surgical Oncology
• Pathology

Background:

• Ectopic thyroid tissue, found along the thyroglossal duct, can undergo malignant transformation.
• Papillary thyroid carcinoma is the most common malignancy in ectopic thyroid tissue, often mirroring native gland pathology.
• Unusual presentations suggest ectopic thyroid carcinoma may arise independently of native thyroid disease.

Observation:

• A 30-year-old woman with Hashimoto's thyroiditis presented with a lateral neck mass suspicious for malignancy.
• Histopathologic evaluation of neck lymph nodes revealed metastatic papillary thyroid carcinoma.
• Subsequent total thyroidectomy showed benign thyroid tissue without evidence of primary carcinoma.

Findings:

• Metastatic papillary thyroid carcinoma was diagnosed in the neck lymph nodes.
• The native thyroid gland was histologically benign, lacking any primary tumor foci.
• The findings supported a hypothesis of primary ectopic thyroid carcinoma.

Implications:

• This case underscores the rare possibility of primary papillary thyroid carcinoma originating in ectopic thyroid tissue.
• Physicians should consider ectopic thyroid carcinoma in the differential diagnosis of neck masses, even with normal native thyroid glands.
• Awareness of independent malignant transformation in ectopic thyroid tissue is crucial for accurate diagnosis and management.