The prevalence of pyramidal lobe of the thyroid gland among Iraqi Society
Abstract
Pyramidal lobe is an embryonic remnant of thyroglossal duct and it is observed as a structure arises upward from the right or the left thyroid lobe or its isthmus. The aim of this study was to determine a variable factors regarding the presence, location, shape and linear measurements of the pyramidal lobe of human thyroid gland. A sixty-four male and forty-one female cadavers with age range of (20-62) years were dissected at the neck region to explore the thyroid gland and clarified its
pyramidal lobe. This anatomical study was carried out at the institute of forensic medicine in Baghdad and the forensic medicine unit in Tikrit teaching hospital during the period from September 2013 to May 2014.
This study observed that the high prevalence of the pyramidal lobe was in females 60.9% than in males 56.3% with total prevalence 58.1% among the population of both genders. Also, it was obvious that the pyramidal lobe arises as extension on the left lobe of the thyroid gland with prevalence 62.3% and the most common shape of it recognized by this study was the pyramidal shape with 50.8%
followed by the triangular shape with 27.9%. The three linear parameters of the pyramidal lobe were measured showing the average length
of the pyramidal lobe was 14.6 +-2.0mm, the average width was 7.7 +- 1.2mm and the average thickness was 2.8 +- 0.9 mm; but there was no significant differences (p>0.05) between the two sexes.