A Postmortem Study of the Pyramidal lobe of the Thyroid Gland in Bangladeshi People

Abstract

Background: The pyramidal lobe is also called the 3rd lobe of the thyroid gland which ascends toward the hyroid bone from the isthmus or the adjacent part of either lobe. A fibrous or fibromascular band the levetor glandulae thyroideae occasionally extends upwards from the apex of the pyramidal lobe to the body of the hyoid bone. Any pathology of thyroid gland involves this lobe, some pathology started from here or recurrence may occur from this lobe. Anatomical knowledge about pyramidal lobe is essential for surgeons, endocrinologists, pathologists and sonologists for proper diagnosis and management of thyroid diseases. Study design: Cross sectional descriptive type of study. Place and period of study: Department of Anatomy, Sir Salimullah Medical College, Dhaka. Study period was from July 2003 to June 2004. Materials: The study was done by examining 60 post mortem human thyroid glands, age ranging from 7 to 67 years. The glands were collected from unclaimed dead bodies autopsied in the morgue of Dhaka Medical College and Sir Salimullah Medical College under the department of Forensic Medicine. Methods: The collected sample were grouped in to three age groups including group A(0-20 years), group B (21-50 years) and group C (>50 years). The presence, variation of position of the pyramidal lobe and its relation with levator glandulae thyroideae were studied. Result: The pyramidal lobe was found in 16 of 60 thyroid glands in different age groups and situated more on the left side than the right. In 9 cases, levator glandulae thyroideae were found. All extended from the apex of the pyramidal lobe to the body of the hyoid bone. Key words: Pyramidal lobe; levator glandulae thyroideae; thyroid gland. DOI: 10.3329/jdmc.v18i2.6270 J Dhaka Med Coll. 2009; 18(2) : 120-123

Anatomical Variations of Thyroid Glands in Northeastern-Thai Embalmed Cadavers

“…Thyroid gland abnormality was found in this research as a result of the emergence of pyramidal lobe (8.8 %). In the previous research conducted with different sample groups, with the diversities of the cadavers' nationalities and the places and the times of study, showed that the percentages of thyroid gland abnormality (18-66 %) were higher than the one found in this research (Braun et Begum et al;Joshi et al;Ozgur et al, 2011;Zivic et al, 2011;Park et al, 2012;Cengiz et al, 2013;Mortensen et al, 2014;Veerahanumaiah et al;Gurleyik et al, 2015;Rajkonwar & Kusre). In 2017, there was a reported case with pyramidal lobe emergence (Gurleyik et al) (Table III).…”

“…On day 24 after fertilization, endoderm tissue of the embryos around the primordial pharynx becomes thicker before finally developing into thyroid primodium (Braun et al, 2007;Begum et al, 2009;. This process takes place together with the development of a tongue which slowly descends along the larynx cavity.…”

Incidence of Pyramidal Lobe and Levator Glandulae Thyroideae of Thyroid Gland in Adult Cadavers: A Morphological Study With Its Surgical Perspective

“…Thyroid gland consists of left and right lobes, which are attached by isthmus [11]. By 4th week of development endodermal thickening in the primitive pharynx turns thicker and undergoes differentiation before developing into thyroid primodium [15,18,19].…”