A solid thyroid benign nodule that showed a significant decrease in size and ultrasonographic findings mimicking...

Area of Science:

• Endocrinology
• Oncology
• Radiology

Background:

• Accurate diagnosis of thyroid nodules is crucial for treatment.
• Ultrasonography and fine needle aspiration biopsy (FNAB) are key diagnostic tools.
• Discordance between ultrasonography and FNAB findings presents treatment challenges.

Observation:

• A 28-year-old female presented with a large, benign-diagnosed thyroid nodule.
• Over time, the nodule decreased in size but developed ultrasonographic features suggestive of malignancy.
• Repeated FNAB confirmed the nodule as benign despite suspicious imaging.

Findings:

• The case illustrates a benign thyroid nodule evolving with malignant-appearing ultrasonographic characteristics.
• Spontaneous regression and changing imaging features in benign nodules can mimic malignancy.
• Persistent benign FNAB results despite suspicious imaging warrant careful consideration.

Implications:

• Clinicians should consider the possibility of benign nodule degeneration when imaging suggests malignancy but cytology is negative.
• This phenomenon challenges current diagnostic paradigms for thyroid nodules.
• Further research is needed to understand the mechanisms and clinical significance of such evolving benign nodules.