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JYMS : Journal of Yeungnam Medical Science

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Hyun Jung Lee 4 Articles
Posterior reversible encephalopathy syndrome related to anemia correction in a patient with uterine myoma: a case report
Jisun Lee, Hyun Jung Lee
J Yeungnam Med Sci. 2022;39(4):336-340.   Published online September 23, 2021
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  • 67 Download
AbstractAbstract PDFSupplementary Material
Although posterior reversible encephalopathy syndrome (PRES) is induced by various causes, a few cases have occurred after severe anemia correction. In this case report, a 45-year-old female patient visited emergency department with a chief complaint of dizziness due to severe anemia related to hypermenorrhea caused by uterine myoma. Before her operation, she had an abrupt headache and seizure during anemia correction with transfusion and injection of gonadotropin-releasing hormone agonist. Immediately after the operation, she experienced visual disturbances, followed by limb weakness and tonic-clonic movements. Magnetic resonance imaging showed alterations in parietal and occipital lobes suggesting cerebrovascular edema with hypoperfusion. Here, we presented and discussed the clinical and radiologic features of PRES related to anemia correction.
Magnetic resonance imaging texture analysis for the evaluation of viable ovarian tissue in patients with ovarian endometriosis: a retrospective case-control study
Dayong Lee, Hyun Jung Lee
J Yeungnam Med Sci. 2022;39(1):24-30.   Published online July 15, 2021
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  • 114 Download
AbstractAbstract PDF
Texture analysis has been used as a method for quantifying image properties based on textural features. The aim of the present study was to evaluate the usefulness of magnetic resonance imaging (MRI) texture analysis for the evaluation of viable ovarian tissue on the perfusion map of ovarian endometriosis.
To generate a normalized perfusion map, subtracted T1-weighted imaging (T1WI), T1WI and contrast-enhanced T-WI with sequences were performed using the same parameters in 25 patients with surgically confirmed ovarian endometriosis. Integrated density is defined as the sum of the values of the pixels in the image or selection. We investigated the parameters for texture analysis in ovarian endometriosis, including angular second moment (ASM), contrast, correlation, inverse difference moment (IDM), and entropy, which is equivalent to the product of area and mean gray value.
The perfusion ratio and integrated density of normal ovary were 0.52±0.05 and 238.72±136.21, respectively. Compared with the normal ovary, the affected ovary showed significant differences in total size (p<0.001), fractional area ratio (p<0.001), and perfusion ratio (p=0.010) but no significant differences in perfused tissue area (p=0.158) and integrated density (p=0.112). In comparison of parameters for texture analysis between the ovary with endometriosis and the contralateral normal ovary, ASM (p=0.004), contrast (p=0.002), IDM (p<0.001), and entropy (p=0.028) showed significant differences. A linear regression analysis revealed that fractional area had significant correlations with ASM (r2=0.211), IDM (r2=0.332), and entropy (r2=0.289).
Magnetic resonance texture analysis could be useful for the evaluation of viable ovarian tissues in patients with ovarian endometriosis.
Usefulness of subtraction pelvic magnetic resonance imaging for detection of ovarian endometriosis
Hyun Jung Lee
Yeungnam Univ J Med. 2020;37(2):90-97.   Published online October 10, 2019
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  • 120 Download
  • 3 Crossref
AbstractAbstract PDF
To minimize damage to the ovarian reserve, it is necessary to evaluate the follicular density in the ovarian tissue surrounding endometrioma on preoperative imaging. The purpose of the present study was to evaluate the usefulness of subtraction pelvic magnetic resonance imaging (MRI) to detect ovarian reserve.
A subtracted T1-weighted image (subT1WI) was obtained by subtracting unenhanced T1WI from contrast-enhanced T1WI (ceT1WI) with similar parameters in 22 patients with ovarian endometrioma. The signal-to-noise ratio (SNR) in ovarian endometrioma, which was classified into the high signal intensity and iso-to-low signal intensity groups on the T2-weighted image, was compared to that in normal ovarian tissue. To evaluate the effect of contrast enhancement, a standardization map was obtained by dividing subT1WI by ceT1WI.
On visual assessment of 22 patients with ovarian endometrioma, 16 patients showed a high signal intensity, and 6 patients showed an iso-to-low signal intensity on T1WI. Although SNR in endometrioma with a high signal intensity was higher than that with an iso-to-low signal intensity, there was no difference in SNR after the subtraction (13.72±77.55 vs. 63.03±43.90, p=0.126). The area of the affected ovary was smaller than that of the normal ovary (121.10±22.48 vs. 380.51±75.87 mm2, p=0.002), but the mean number of pixels in the viable remaining tissue of the affected ovary was similar to that of the normal ovary (0.53±0.09 vs. 0.47±0.09, p=0.682).
The subtraction technique used with pelvic MRI could reveal the extent of endometrial invasion of the normal ovarian tissue and viable remnant ovarian tissue.


Citations to this article as recorded by  
  • Biaxial ultrasound driving technique for small animal blood–brain barrier opening
    Carly Pellow, Siyun Li, Sagid Delgado, G Bruce Pike, Laura Curiel, Samuel Pichardo
    Physics in Medicine & Biology.2023; 68(19): 195006.     CrossRef
  • Magnetic resonance imaging texture analysis for the evaluation of viable ovarian tissue in patients with ovarian endometriosis: a retrospective case-control study
    Dayong Lee, Hyun Jung Lee
    Journal of Yeungnam Medical Science.2022; 39(1): 24.     CrossRef
  • Diagnosis and Nursing Intervention of Gynecological Ovarian Endometriosis with Magnetic Resonance Imaging under Artificial Intelligence Algorithm
    Nijie Jiang, Hong Xie, Jiao Lin, Yun Wang, Yanan Yin, Arpit Bhardwaj
    Computational Intelligence and Neuroscience.2022; 2022: 1.     CrossRef
Metastatic papillary thyroid cancers with malignant pleural effusion aggravated during thyroid hormone withdrawal for radioiodine therapy.
Ji Hye Seo, Ji Hye Je, Hyun Jung Lee, Young Ju Na, Il Woo Jeong, Jee Hyun An, Sin Gon Kim, Dong Seop Choi, Nam Hoon Kim
Yeungnam Univ J Med. 2015;32(2):138-142.   Published online December 31, 2015
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  • 5 Download
AbstractAbstract PDF
L-thyroxine (LT4) withdrawal prior to radioactive iodine (RAI) ablation therapy is a commonly used method for successful treatment of patients with papillary thyroid cancer (PTC). However, a prolonged period of hypothyroidism induced by LT4 withdrawal is sometimes associated with impaired quality of life and cardiopulmonary dysfunction in PTC patients. Furthermore, LT4 withdrawal may have a trophic effect on residual cancer by means of increased thyrotropin. We report on 2 cases of metastatic PTC patients with malignant pleural effusion (MPE) whose disease showed rapid worsening after LT4 withdrawal and RAI therapy. The first case is a 65-year-old woman who had PTC with multiple distant metastases and MPE. During LT4 withdrawal for RAI therapy, MPE showed rapid worsening, and the patient required repetitive therapeutic thoracentesis. The second case is a 49-year-old woman with PTC who underwent 3 additional operations for cancer recurrence in the neck lymph nodes and 6 times of RAI treatments. While preparing for the 7th RAI treatment by withdrawing LT4, she developed MPE which became progressively aggravated after RAI therapy. Both patients experienced increased pleural effusion during the LT4 withdrawal period and a rise in the thyroglobulin level was observed after RAI therapy. MPE was not controlled with therapeutic thoracentesis and pleurodesis. Eventually, both patients died of rapid disease progression after RAI therapy. In summary, LT4 withdrawal may have an adverse effect on metastatic PTC patients, particularly those with MPE.

JYMS : Journal of Yeungnam Medical Science