Agenesis of isthmus of thyroid gland in adult human cadavers: a case series

Dixit, Daksha; Shilpa, M; Harsh, M; Ravishankar, M

doi:10.1186/1757-1627-2-6640

Cited by 9 publications

(15 citation statements)

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“…Agenesis of isthmus of thyroid gland is rare in humans, the incidence varying from 5% to 10 %. 7 In our study incidence of absence of isthmus is in 9% (8 specimens), out of which 5 were male specimens & 3 were female specimens. This observation can be compared with studies done by Marshall The isthmus may be missing in the amphibians, birds and among mammals -monotremes, certain marsupials, cetaceans, carnivores and rodents.…”

Section: Discussionmentioning

confidence: 46%

“…6 Agenesis of isthmus can be associated with other types of dysorganogenesis, such as the absence of a lobe or presence of ectopic thyroid tissue & hence in clinical practice when such a condition is diagnosed, it is necessary to perform a differential diagnosis against other pathologies such as autonomous thyroid nodule, thyroiditis and so on. 7 While planning for thyroidectomy one should be prepared to find variations like ectopic thyroid nodules around normally located thyroid gland.…”

Section: Resultsmentioning

confidence: 99%

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Morphological variations of the Thyroid gland

2015

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Isthmus of Thyroid gland is constricted part which connects the Thyroid lobes in the median plane. The isthmus vary greatly & sometimes may be absent. 1 Agenesis of the thyroid isthmus can also be defined as the ABSTRACT Background: The knowledge of various morphological & developmental anomalies of thyroid gland will help the surgeons in better planning of safe & effective surgery. Considering these facts we studied the variations of thyroid gland. Methods: The material for the present study was collected from the department of forensic medicine, MMC & RI, Mysore, which includes 56 male and 33 female adult postmortem cadavers aged between 18 to 80 years. A dissection was carried out to expose thyroid glands & variations were observed in the morphology of thyroid gland. Results: 1) 9% of specimens had agenesis of isthmus. 2) 46% of specimens had pyramidal lobe. 3) 41% of specimens had levator glanduli thyroidae. 4) 2.24 % of specimens had accessory thyroid tissue. Conclusion: This study highlights the various morphological anomalies of the thyroid gland which forms cornerstone to safe & effective surgery.

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Section: Discussionmentioning

confidence: 46%

Section: Resultsmentioning

confidence: 99%

Morphological variations of the Thyroid gland

2015

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“…and anteroposterior extent being 3 cm and 2 cm respectively. The isthmus measures about 1.25 cm transversely as well as vertically and is usually placed anterior to the second and third tracheal cartilages [2]. Most of the diseases affecting the thyroid gland e.g.…”

Section: Introductionmentioning

confidence: 99%

An Anatomical Study of Morphological Variations of the Thyroid Gland

Gaikwad¹,

Joshi²

2016

IJAR

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“…The anomalies of the development Developmentally, the first endocrine gland in the embryo is the thyroid gland [1]. It is highly vascular endocrine gland composed of two lateral lobes connected by a narrow median isthmus giving an 'H' shaped appearance to the gland [2]. A wide range of multiple morphological variations and developmental anomalies of the thyroid gland have been reported in the literature [3].…”

Section: International Journal Of Anatomy and Research Int J Anat Rementioning

confidence: 99%

Multiple Morphological Variations in the Thyroid Gland: Report of Two Cases

Nikumbh¹,

Nikumbh²,

Doshi³

2015

IJAR

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The variety of multiple morphological variations in the thyroid gland is found as a result of disturbed organogenesis in humans as agenesis, hypoplasia, accessory, ectopy and hemiagenesis. In the routine undergraduate dissection of the thyroid gland, multiple anomalies of the thyroid gland were encountered in 50 and 60 years old female and male cadaver respectively. These were in form of absent isthmus with accessory thyroid lobe in between two lateral lobes, pyramidal lobe arising from left lobe of thyroid with levator glandulae thyroidae in first case. Second case showed narrow isthmus related to first tracheal ring and levator glandulae thyroidae arising from left lobe. In these case studies, we highlight various developmental anomalies of the thyroid gland as absent isthmus, pyramidal lobe and accessory lobe with levator glandulae thyroidae. Hence a thorough knowledge of such morphological variations of thyroid gland helps the surgeons in better planning of safe, effective and uncomplicated operative procedures in resection of thyroid and tracheotomy procedures.

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Agenesis of isthmus of thyroid gland in adult human cadavers: a case series

Cited by 9 publications

References 0 publications

Morphological variations of the Thyroid gland

Morphological variations of the Thyroid gland

An Anatomical Study of Morphological Variations of the Thyroid Gland

Multiple Morphological Variations in the Thyroid Gland: Report of Two Cases

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