Type of Article: Original Research
Year: 2016 | Volume 4 | Issue 3 | Page No. 2665-2669
Date of Publication: 31-08-2016
AN ANATOMICAL STUDY OF MORPHOLOGICAL VARIATIONS OF THE THYROID GLAND
Shobha Gaikwad * 1, Rajani Joshi 2.
*1 Assistant Professor, Department of Anatomy, Seth G S Medical College and KEM Hospital , Parel, Mumbai, Maharashtra, India.
2 Professor and Head, Department of Anatomy, R.C.S.M. Govt Medical College and CPR Hospital, Kolhapur, Maharashtra, India.
Address: Dr Shobha Gaikwad, Assistant Professor, Department of Anatomy, 2nd floor, Seth G S Medical College and KEM Hospital, Parel, Mumbai, Maharashtra, India -400012, Mobile No. 8652868522
Introduction: The organogenesis of the thyroid gland in humans is often disturbed, leading to a variety of morphological variations of the gland, such as presence of pyramidal lobe, levator glandulae thyroidae , pyramidal lobe along with levator glandulae thyroidae , absence of isthmus and presence of accessory thyroid tissue . As the morphological variations are usually diagnosed incidentally during examination for other thyroid gland diseases, the true incidence is therefore uncertain.
Methods: This study was structured to investigate the gross anatomical features of the thyroid gland in 100 (58 male and 42 female) cadavers from the Maharashtrian population.
Results: The variations in the thyroid gland were present in 94% of cases. In the present study; the most common variation was presence of Levator glandulae thyroidae (30.85%) and least common variation was accessory thyroid tissue (1.6 %). The isthmus was absent in 28(29.78%) cases. Absence of isthmus was more common in females than in males and the difference was statistically significant. Pyramidal lobe was more common in males than in females. Most commonly the pyramidal lobe arises from the isthmus of the thyroid gland and least commonly from the left lobe. Levator glandulae thyroidae was present in 19 male cases (32.75%) and 10 female cases (23.80%). Pyramidal lobe along with levator glandulae thyroidae was present in 8 males (72.72%) and in 3 females (27.27%). However, the accessory thyroid tissue was found in only one cadaver.
Conclusion: This study highlights the various developmental anomalies of the thyroid gland, which forms a cornerstone to safe and effective surgery.
Key words: Accessory Thyroid Tissue, Anatomical Variations, Levatorglandulaethyroidae, Pyramidal Lobe, Absence Of Isthmus
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Shobha Gaikwad, Rajani Joshi. AN ANATOMICAL STUDY OF MORPHOLOGICAL VARIATIONS OF THE THYROID GLAND. Int J Anat Res 2016;4(3):2665-2669. DOI: 10.16965/ijar.2016.297