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A Rare Duodenal Subepithelial Tumor: Duodenal Schwannoma
Dong Hwahn Kahng,김광하,Sang Gyu Park,So Jeong Lee,Do Youn Park 대한소화기내시경학회 2018 Clinical Endoscopy Vol.51 No.6
Schwannomas are uncommon neoplasms that arise from Schwann cells of the neural sheath. Gastrointestinal schwannomas are rareamong mesenchymal tumors of the gastrointestinal tract, and only a few cases have been reported to date. Duodenal schwannomas areusually discovered incidentally and achieving a preoperative diagnosis is difficult. Schwannomas can be distinguished from othersubepithelial tumors on endoscopic ultrasonography; however, any typical endosonographic features of duodenal schwannomas havenot been reported due to the rarity of these tumors. Immunohistochemistry is essential to distinguish schwannomas fromgastrointestinal stromal tumors and leiomyomas. We report a case of duodenal schwannoma found incidentally during a health checkupendoscopy. On endoscopic ultrasonography, this tumor was suspected as a gastrointestinal stromal tumor; therefore, the patientunderwent laparoscopic wedge resection of the tumor. Histopathology and immunohistochemistry confirmed that the duodenal lesionwas a benign schwannoma.
MicroRNA Expression in Plasma of Esophageal Squamous Cell Carcinoma Patients
Kahng Dong Hwahn,Kim Gwang Ha,Park Su Jin,Kim Sora,Lee Moon Won,Lee Bong Eun,I Hoseok 대한의학회 2022 Journal of Korean medical science Vol.37 No.24
Background: Patients with esophageal squamous cell carcinoma (ESCC) have a poor prognosis and there are no effective clinical biomarkers. Recently, stable microRNAs detected in the blood have been suggested as potential biomarkers in various cancers. Therefore, we investigated whether plasma microRNAs could be feasible biomarkers for ESCC. Methods: Peripheral blood samples were obtained from 16 healthy volunteers and 66 ESCC patients before treatment between May 2016 and April 2021. Plasma miR-18b, miR-21, miR31, and miR-375 expression levels were measured using reverse transcription-quantitative polymerase chain reaction. Results: Compared with those in healthy controls, the expression levels of plasma miR-21 were significantly higher (P = 0.022) and those of plasma miR-31 and miR-375 were significantly lower in ESCC patients (both P < 0.001). Plasma miR-18b expression levels increased in ESCC patients, but the difference was not significant (P = 0.164). The sensitivities and specificities of miR-21, miR-31, and miR-375 for differentiating ESCC patients from healthy controls were 87.5% and 61.9%, 87.5% and 98.4%, and 87.5% and 100%, respectively. There was no difference in expression levels of plasma miR-21, miR-31, and miR-375 according to clinicopathological characteristics of sex, age, tumor size and location, histologic grade, and tumor-node-metastasis stage. Conclusion: Our study demonstrated that plasma miR-21, miR-31, and miR-375 could be potential biomarkers for the diagnosis of ESCC. Particularly, plasma miR-31 and miR-375 showed high sensitivity and specificity for differentiating ESCC patients from healthy controls.
최유이 ( Yu Yi Choi ),이지원 ( Ji Won Yi ),강동환 ( Dong Hwahn Kahng ),서형일 ( Hyung Il Seo ),김석 ( Suk Kim ),박도윤 ( Do Youn Park ) 대한내과학회 2013 대한내과학회지 Vol.84 No.5
Pancreatic arteriovenous malformations (AVMs) are rare, and most cases occur as congenital anomalies. Many patients with AVM are asymptomatic, but occasionally present with abdominal pain or gastrointestinal bleeding. The increased portal vein flow that forms these malformations can lead to portal hypertension and gastrointestinal bleeding in the absence of primary liver pathology. Early diagnosis can lead to successful surgical resection or percutaneous transarterial embolization. We report a case of a patient with pancreatic AVM in the tail of the pancreas, in which endoscopic ultrasonography was helpful. This patient presented with abdominal pain and was subsequently treated with distal pancreatectomy. (Korean J Med 2013; 84:708-712)
박상규 ( Sang Gyu Park ),김광하 ( Gwang Ha Kim ),박호준 ( Ho Joon Park ),강동환 ( Dong Hwahn Kahng ),이봉은 ( Bong Eun Lee ),박도윤 ( Do Youn Park ) 대한소화기학회 2018 대한소화기학회지 Vol.72 No.1
An inflammatory myofibroblastic tumor (IMT) is a rare disease that can occur in a variety of locations, including the lung, orbit, parotid, pleura, and stomach. Despite multiple reports in various organs, a duodenal IMT is rare with limited case reports. We encountered a case of a 49-year-old male with a duodenal IMT. The patient underwent a laparoscopic wedge resection under the impression of a duodenal mesenchymal tumor, such as gastrointestinal stromal tumor, but the final diagnosis was a duodenal IMT. The patient was treated successfully with an oral nonsteroidal anti-inflammatory drug for the residual lesions. He was free of recurrence during the 12 month follow-up period. (Korean J Gastroenterol 2018;72:28-32)