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International Journal of Anatomical Variations

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Agenesis of thyroid isthmus associated with a rare variation of origin of superior laryngeal and cricothyroid arteries: Case report and review of the literature

Author(s): Tata Toure*, Babou Ba, Abdoulaye Kante, Falle Traore, Moumouna Kone, Gaoussou Simpara, Drissa Traore, Mohamed Keita and Nouhoun Ongoiba

Agenesis of the thyroid isthmus was observed in an adult male cadaver during a routine dissection at the anatomy laboratory of the Faculty of Medicine and Odontostomatology (FMOS) in Bamako. The two thyroid lobes were completely separated from each other. The left lobe presented the pyramidal lobe. The supra and infra-isthmic arches were absent, the upper right and left thyroid arteries did not anastomose, as did the lower right and left thyroid arteries. On the right side, the superior laryngeal and crico-thyroid arteries were born by a common trunk which came from the external carotid artery by a common trunk with the lingual and superior thyroid arteries.


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