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Atlas of Human Body Ultrasound Scanning_ Methods and Diagnostic Applications ( PDFDrive ).pdf
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36

L. Tan and J. Li

 

 

2\ The Longitudinal View of

the Thyroid

Fig. 4.2  The longitudinal view of the thyroid

THY

E

2.1\ Scanning Method

2.2\ Section Structure

The patient is positioned supine with the neck slightly extended. The probe is located on the neck below the thyroid cartilage and swept each lateral lobe in the longitudinal views from the level of fifth cervical vertebra to the seventh.

In the longitudinal view, the lobe of the thyroid appears as a spindle with round upper pole and pointed lower pole. The recurrent laryngeal nerve may be visualized as a linear, hypoechoic structure. The right side runs between the right lateral

4  Thyroid Scanning

37

 

 

lobe of thyroid and the musculus longus colli, and the left nerve lies between the left lobe of thyroid and the esophagus.

2.3\ Measuring Method

and Normal Value

In the maximum longitudinal plane, the length is measured from the cranial to the caudal ends of the lobe. The length of the isthmus is measured using the same way. The normal length is

4.0–6.0 cm for the thyroid lobe and 1.5–2.0 cm for the isthmus. The normal volume of thyroid varies a lot from each other. The length of the lateral lobe may be 7–8 cm for the slim and tall and less than 5 cm for the chunks.

2.4\ The Clinical Application Value

This section is used to observe the size, shape, borderline, and internal architecture of the thyroid gland and to characterize the nodules.

38

L. Tan and J. Li

 

 

3\ Longitudinal Scanning of the

Pyramidal Lobe of Thyroid

Fig. 4.3  Longitudinal scan of the pyramidal lobe of thyroid

Pyramidal lobe

3.1\ Scanning Method

No specific preparation is required prior to the scan. The patient is placed in the supine position with the neck slightly extended. The probe is located on the neck below the thyroid cartilage, equal to the level of fifth cervical vertebra to the seventh. This region is scanned cranially from the

isthmus both in the longitudinal and transverse view.

3.2\ Section Structure

On gray ultrasound, the pyramidal lobe is isoechoic compared to the normal thyroid paren-

4  Thyroid Scanning

39

 

 

chymal. On transverse scan, it is located superior to the isthmus. On longitudinal scan, it shows as a thin, linear structure connecting with the isthmus.

3.3\ The Clinical Application Value

This structure is a thyroid normal variation and should be distinguished from occupancy lesions.