Endocrinology and Metabolism

Hyun Joo Jung (Jung HJ)

3 Articles

A Case of Follicular Thyroid Carcinoma Associated with Hemiagenesis of Thyroid Gland.: Bu Kyung Kim, Hyun Joo Jung, Ye Na Kim, Young Sik Choi, Yo Han Park, Hee Kyoung Chang, Jeong Hoon Kim; J Korean Endocr Soc. 2010;25(1):46-49. Published online March 1, 2010; DOI: https://doi.org/10.3803/jkes.2010.25.1.46

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Thyroid hemiagenesis is a rare congenital anomaly, in which one thyroid lobe fails to develop. Thyroid hemiagenesis is associated with thyroid diseases such as Graves' disease, Hashimoto's thyroiditis, colloidal goiter and thyroid follicular and papillary cancer. A 53-year-old female patient was diagnosed with a thyroid nodule on health examination. A 99mTc pertechnetate thyroid scan showed absent uptake in the left lobe and cold nodule on the right lobe of thyroid gland. By ultrasonography, we found hemiagenesis in the left thyroid gland and an irregular shaped thyroid nodule on the right lobe of thyroid gland. We performed ultrasonography guided fine needle aspiration and cytologic analysis showed indeterminate nature. Thyroidectomy was performed and finally diagnosed follicular carcinoma of thyroid gland. The authors report this case with a literature review.

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A Case of Thyroid Hemiagenesis with Concurrent Papillary Thyroid Carcinoma
Ye-Mo Nam, June Sik Park, Kyung Jin Na, Dongbin Ahn
Korean Journal of Otorhinolaryngology-Head and Neck Surgery.2011; 54(8): 557. CrossRef

Endocrinological and Morphological Characteristics of Clinically Nonfunctioning Pituitary Adenoma.: Jae Wha Jo, Moon Suk Nam, Hyun Chul Lee, Tae Seung Kim, Kyu Chang Lee, Hyun Joo Jung; J Korean Endocr Soc. 1994;9(3):200-212. Published online November 6, 2019

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Abstract PDF: Forth-nine patients with clinically nonfunctioning pituitary adenomas were evaluated clinically, endocrinologically and morphologically in this study.The results obtained were as follows.1) The mean age was 47.1 years(range 23 to 76 years), and 22 were male(44.9%) and 27(55.1%) female.2) The major clinical manifestations of male patients were visual disturbance(72.7%), headache(54.5%), loss of libido(45.5%), but those of female visual disturbance(59.6%), headache(48.1%), amenorrhea(48.1%), loss of body hair(25.9%), and galactorrhea(22.2%).3) All were macroadenomas evaluated by CT scan, and in the male patients 16(72.7%) were grade III and 6(27.3%) grade IV by Hardy classification, and in the female patients 6(22.2%) were grade II, 12(44.4%) grade III, and 9(33.3%) grade IV.4) The elevation of serum prolactin were observed 7(31.8%) out of male, and 24(88.9%) of female.5) Combined stimulation test revealed that GH insufficiency was 89.6%, ACTH 58.9%, LH 58.7%, FSH 51.1 %, and TSH 50.0% and hormone insufficiency more than 4 pituitary hormone was 54.2%.6) Prolactin response to TRH decreased in 12(70.6%) of 17 patients with normal basal prolactin, and 19(76.0%) of 25 with elevated prolactin.7) Immunohistochemistry revealed that null cell adenoma was 57.1%, gonadotrope adenoma 26.5%, plurihormonal adenoma 8.0%, silent corticotrope adenoma 4.0%, thyrotrope adenoma(2.0%), and lactotrope adenoma(2.0%).8) The ultrastructural characteristics examined by electron-microscopy were similar despite of immunohistochemical differences.In summary, the prevalance of clinically nonfunctioning pituitary adenoma was middle aged men and women, and their main symptoms were visual disturbance and headache. Hyperprolactinemia and pituitary hormone insufficiency more than 4 hormone were observed commonly. Most of them were null cell adenoma and gonadotrope adenoma examined by immunohistochemistry. Further study using modern techniques: cell culture, subunit-immunostaining. And Northern blot analysis of mRNA for pituitary hormone or subunit, will be needed to clarify null cell adenomas.

In Situ Hybridization Analysis of Human Growth Hormone and Prolactin Secreting Pitultary Adenomas.: Jae Wha Jo, Eun Jig Lee, Moon Suk Nam, Kyung Rae Kim, Sung Kil Lim, Hyun Chul Lee, Kap Bum Huh, Tae Seung Kim, Sun Ho Kim, Joong Uhn Choi, Kyu Chang Lee, Hyun Joo Jung, Sang Seop Chung; J Korean Endocr Soc. 1994;9(2):82-92. Published online November 6, 2019

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Abstract PDF: A non-isotopic in situ hybridization method with biotin-labelled oligonucleotide probes was used to examine growth hormone(GH) and prolactin(PRL) gene expression in 32 patients with pituitary adenomas; 13 were prolactinomas, 8 GH secreting adenomas, and 11 mixed GH and PRL secreting adenomas.Positive immunostaining for GH was found in all patients with GH secreting adenomas, and mixed GH and PRL secreting adenomas. Positive immunostaining for PRL was found in all patients with prolactinomas and 9(81.8%) of 11 mixed GH and PRL secreting adenomas, 5(62.5%) of 8 GH secreting adenomas. Immunohistochemistry revealed that 13 were lactotrope adenomas, 5 somatotrope adenomas, and 14 GH and PRL cell adenomas.In situ hybridization revealed that GH mRNA expression was found in all the patients with somatotrope adenomas and GH and PRL cell adenomas, and 6(46.1%) of 13 lactotrope adenomas. PRL mRNA expression was 100% in lactotrope and GH and PRL cell adenomas, and 4(80.0%) of 5 somatotrope adenomas.The patients with a clinical diagnosis of acromegaly had detectable PRL mRNA in their neoplasm and it is suggested that the PRL cells in the adenomas did not result from dedifferentiation, but from the neoplastic stimulus for some mixed tumors probably occurred in cells previously committed to produce PRL and GH. In lactotrope adenomas, the PRL cells of the patients without expression of GH mRNA may be arised from cells programmed to secrete PRL or precussor PRL cells rather than from mixed GH-PRL cells. The finding that some patients produced mRNA detectable by in situ hybridization, but no hormone detectable by immunohistochemistry within tumor was suggested of a silent adenoma.These observations indicated that in situ hybridization studies may improve the classification of pituitary adenomas and may provide a precise knowledge of the biology of these neoplasms.

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