<abstract xmlns="http://www.w3.org/1999/xhtml">

<p><bold>Introduction:</bold> Ultrasound is the most reliable imaging modality for thyroid evaluation due to the limitations in the clinical examination of this gland. Thyroid gland developmental anomalies are rare. Most of its variations are due to the persistence of the thyroglossal duct and the absence of the isthmus. The aim of this study was to determine the incidence of pyramidal lobe and agenesis of the thyroid isthmus in Nnewi population using ultrasound. <bold>Materials and method:</bold> A total of 321 subjects resident in Nnewi, including 167 males and 154 females, were randomized. A written consent was obtained from all patients. The subjects were aged between 18 and 35 years. This was a prospective cross-sectional study. Thyroid glands were scanned using a 2-dimensional ultrasound machine with a 7.5 MHz transducer; model Siemens Sonoline Prima which was made in Japan for Siemens Medical System Incorporated, ultrasound Group, Issaquah, WA, 98029-7002, USA. <bold>Results:</bold> The study revealed no incidence of pyramidal lobe and agenesis of the thyroid isthmus in the study population. <bold>Conclusion:</bold> This study has clearly demonstrated no incidence of pyramidal lobe and agenesis of the thyroid isthmus in subjects resident in Nnewi, Nigeria.</p>
</abstract>

Introduction: Ultrasound is the most reliable imaging modality for thyroid evaluation due to the limitations in the clinical examination of this gland. Thyroid gland developmental anomalies are rare. Most of its variations are due to the persistence of the thyroglossal duct and the absence of the isthmus. The aim of this study was to determine the incidence of pyramidal lobe and agenesis of the thyroid isthmus in Nnewi population using ultrasound. Materials and method: A total of 321 subjects resident in Nnewi, including 167 males and 154 females, were randomized. A written consent was obtained from all patients. The subjects were aged between 18 and 35 years. This was a prospective cross-sectional study. Thyroid glands were scanned using a 2-dimensional ultrasound machine with a 7.5 MHz transducer; model Siemens Sonoline Prima which was made in Japan for Siemens Medical System Incorporated, ultrasound Group, Issaquah, WA, 98029-7002, USA. Results: The study revealed no incidence of pyramidal lobe and agenesis of the thyroid isthmus in the study population. Conclusion: This study has clearly demonstrated no incidence of pyramidal lobe and agenesis of the thyroid isthmus in subjects resident in Nnewi, Nigeria.

Ultrasonographic study of the incidence of pyramidal lobe and agenesis of the thyroid isthmus in Nnewi population

Journal of Ultrasonography

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Introduction: Ultrasound is the most reliable imaging modality for thyroid evaluation due to the limitations in the clinical examination of this gland. Thyroid...

Age (years)	Males	Females	Total
18–23	49 (29.8%)	125 (79.6%)	174
24–29	87 (53.1%)	22 (14%)	109
30–35	28 (17.1%)	10 (6.4%)	38
Total	164	157	321

	Age groups (years)
	18–23	24–29	30–35	Total mean
Males (years) ± SD	21.47 ± 1.31	25.93 ± 1.68	33.32 ± 1.87	25.86 ± 4.24
Females (years) ± SD	20.85 ± 1.60	25.77 ± 1.69	31.80 ± 1.55	22.24 ± 3.43
t-value	2.417	0.393	2.520	8.408
p-value	0.017^*	0.697	0.021^*	0.000^*

Morphological anomaly	Number of subjects	Percentage (%)
Pyramidal lobe	Nil	0
Total agenesis of the isthmus	Nil	0
Partial agenesis of the isthmus	Nil	0

Ultrasonographic study of the incidence of pyramidal lobe and agenesis of the thyroid isthmus in Nnewi population

Article Category: original-paper

Publicado en línea: 31 ene 2019

Páginas: 290 - 295

Recibido: 16 may 2018

Aceptado: 31 dic 2018

DOI: https://doi.org/10.15557/jou.2018.0042

Palabras clave
thyroid gland, pyramidal lobe, agenesis, Nnewi

© 2018 Lotanna Somtoo Akudu et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

Fig. 2.

Age and sex distribution of the subjects

Descriptive characteristics of the age groups of male and female subjects

Incidence of the pyramidal lobe and agenesis of the isthmus

Ultrasonographic study of the incidence of pyramidal lobe and agenesis of the thyroid isthmus in Nnewi population

Article Category: original-paper

Publicado en línea: 31 ene 2019

Páginas: 290 - 295

Recibido: 16 may 2018

Aceptado: 31 dic 2018

DOI: https://doi.org/10.15557/jou.2018.0042

Palabras clavethyroid gland, pyramidal lobe, agenesis, Nnewi

© 2018 Lotanna Somtoo Akudu et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

Fig. 2.

Age and sex distribution of the subjects

Descriptive characteristics of the age groups of male and female subjects

Incidence of the pyramidal lobe and agenesis of the isthmus

Palabras clave
thyroid gland, pyramidal lobe, agenesis, Nnewi