Does Size Matter? Evaluation of malignancy rate differences between small and large thyroid follicular neoplasms

Area of Science:

• Endocrinology
• Surgical Pathology
• Oncology

Background:

• Thyroid follicular neoplasms represent a common diagnostic challenge.
• Distinguishing between benign and malignant follicular neoplasms is crucial for patient management.

Purpose of the Study:

• To investigate the relationship between thyroid follicular neoplasm size and malignancy rates.
• To determine if lesion size can predict the likelihood of malignancy.

Main Methods:

• Retrospective chart review of 117 patients with thyroid fine-needle biopsy diagnosis of "follicular neoplasm" undergoing thyroidectomy.
• Lesions were categorized into "small" (<= 2.2 cm) and "large" (> 2.2 cm) based on median size.
• Malignancy rates were compared between the two groups using chi-square analysis and ROC curve analysis.

Main Results:

• The malignancy rate for small nodules (<= 2.2 cm) was 16.7%, while for large nodules (> 2.2 cm) it was 26.3%.
• Statistical analysis revealed no significant difference in malignancy rates between small and large follicular neoplasms (p = .20).
• Receiver operating characteristic (ROC) curve analysis indicated that tumor size is not a reliable predictor of malignancy, with an area under the curve of 0.52.

Conclusions:

• Thyroid follicular neoplasm size does not correlate with malignancy rates.
• Tumor size is not a useful diagnostic tool for predicting malignancy in follicular neoplasms.
• Further research may explore other diagnostic markers for these lesions.