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Size and Positional Relationships between Thyroid Lobes in the Adult as Determined by Scintillation Scanning¹

New Haven, Conn.

ABSTRACT

Following oral administration of sodium iodide ¹³¹I, scintillation scans of thenormal adult thyroid were performed, at 24 hours, in the anteroposterior direction.Dimensions and locations of the right and left thyroid lobes were determined.

1. A left lobe beginning higher in the neck than the right was unusual (6%). The right lobe extended lower in the neck than the left in 23 cases, while in five individuals the two lobes ended at the same level.

2. The mean longest dimension of the right lobe was 11 percent greater than the left, and its mean greatest width was 5 percent greater. In only three cases (6%) was the left lobe both longer and broader than the right.

3. By the method of least squares, for this selected population of 50 individuals, the linear equation relating the length of the right thyroid lobe (R) to that of the left (L) in cm was found to be: R = 0.94L + 0.8.

4. The use of a simple cylindrical model in estimating the weight of the normal thyroid was proposed.

FOOTNOTES

¹ Supported by USPHS Research Grants Nos. HD 00411 and CA 6519.

² Section of Nuclear Medicine, Department of Radiology, Yale University School of Medicine, New Haven, Connecticut.