A 25-year-old female underwent thyroid ultrasound scan. The isthmus and the right lobe of thyroid appeared normal. The patient had had no surgical procedure performed in the neck region.
What is the most likely diagnosis?
A. Normal left lobe of the thyroid
B. Agenesis of the left lobe of the thyroid
C. Hypoplastic left lobe of the thyroid
Images courtesy of UltrasoundCases.info, owned by SonoSkills.
Explanation
The image shows a normal isthmus and a normal right lobe of the thyroid. Observe that the left lobe of the thyroid is significantly smaller in size.
Figure 1. Normal right lobe and isthmus. Observe the much smaller left lobe of the thyroid.
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