https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/461 2026-07-03T23:05:37Z https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/213328 Title: Prediction of Posterior Communicating Artery Aneurysm Rupture Risk: A Multivariate Analysis of Aneurysm and Surrounding Arterial Morphological Factors Authors: Nahm, Minu; Ko, Shin-Woong; Yi, Hyeong-Joong; Chun, Hyeong-Joon; Na, Min-Kyun; Lee, Young-Jun; Kim, KyuNam; Lee, Sang Hyung; Ryu, Jaiyoung; Song, Simon; Han, Kunhee; Choi, Kyu-Sun Abstract: Background/Objectives: Recent studies have increasingly focused on the morphological characteristics of surrounding arteries as rupture predictors, particularly because these vessel configurations remain stable before and after aneurysm rupture, providing a reliable anatomical substrate for risk assessment. This study aimed to identify independent predictors of rupture by evaluating both aneurysmal and internal carotid artery (ICA) morphological characteristics. Methods: We retrospectively analyzed imaging data from 64 patients with posterior communicating artery (PcomA) aneurysms who underwent treatment at a single tertiary center between 2018 and 2022, including 25 ruptured aneurysms (39.1%). Only treated aneurysms were included to ensure the availability of high-quality pre-treatment digital subtraction angiography (DSA) suitable for three-dimensional (3D) reconstruction and centerline-based analysis. Seventeen aneurysm morphological parameters and thirteen ICA-related parameters were measured. Because time-to-event data were not available, logistic regression analysis was performed with rupture status as the outcome variable. Receiver operating characteristic (ROC) curve analyses were conducted to evaluate discriminative performance. Results: Multivariate logistic regression revealed that three ICA-associated factors—the tortuosity of the communicating ICA segment (Tcco), the ICA cross-sectional area at the PcomA origin (Pcs), and the angle between the ICA and PcomA (θ2)—were independently associated with rupture. Among aneurysm-related factors, Maximum 3D Diameter remained significantly related to rupture risk. ROC analyses demonstrated that Maximum 3D Diameter had the highest discriminative value (AUC 0.779; cut-off 7.805 mm), followed by Pcs, Tcco, and θ2. Conclusions: Both aneurysm morphology and the anatomical configuration of surrounding arteries significantly contribute to rupture risk in PcomA aneurysms. Incorporating parent-vessel morphological features into rupture-risk assessment may enhance patient-specific decision-making. 2026-05-01T00:00:00Z https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/217703 Title: Rapid Spontaneous Tumor Regression Mimicking Pseudoprogression in Pembrolizumab-treated Non–small Cell Lung Cancer Authors: Yoo, Seung-Jin; Lee, Hyun; Myung, Jae Kyung; Choi, Yun Young; Lee, Soo Jin Abstract: Atypical tumor responses can occur during immune checkpoint inhibitor therapy. A 71-year-old man receiving pembrolizumab treatment for stage IV non–small cell lung cancer was found on 18F-FDG PET/CT to have developed new lesions in the stomach, left adrenal gland, and lungs. Because a gastric biopsy confirmed metastatic disease, treatment was discontinued. Remarkably, all lesions resolved after 4 weeks without any treatment. Pembrolizumab therapy was restarted, and follow-up CT showed further reduction in the lung cancer without new lesions. This case of spontaneous regression of gastric metastasis mimicking a pseudoprogression response to pembrolizumab treatment highlights the possibility of unusual presentations during immunotherapy. 2026-05-01T00:00:00Z https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/215108 Title: 특징적 MRI 소견의 근육 유육종증 Authors: 이승훈 2026-04-17T00:00:00Z https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/215109 Title: Osteolytic pelvic osteosarcoma mimicking GCT Authors: 이승훈 2026-04-17T00:00:00Z