• Proceedings of the Korea Inteligent Information System Society Conference
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• 2007.11a
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• pp.520-529
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• 2007

간암은 세계적으로 흔한 악성 종양에 속하지만 우리나라에서 간암은 위암, 폐암 다음으로 높은 사망률을 보이며 이러한 간암은 조기진단이 요구된다. 전문의는 간암의 진단을 위해 조영증강 CT영상을 이용하여 육안으로 간암을 판별하는데, 조영증강 CT영상을 이용한 진단은 주 종양의 진단에는 도움이 되지만 주 종양에서 주위 간 조직으로 전이된 간암들을 판별하는 것은 어려우며 실제로 시술 중에야 전이된 간암의 존재를 알 수 있다. 본 논문에서는 조영증강 CT영상을 이용하여 간과 주 종양을 자동으로 추출한 후, 미세하게 주 종양 주위로 전위된 간암들을 추출하는 방법을 제안하여 전문의를 보조할 수 있는 보조 전문가 시스템으로서의 유용성을 확인하고자한다. 조영증강 CT영상은 흉부에서 5mm간격으로 40 ${\sim}$ 50장정도로 촬영된다. 조영증강 CT영상을 이용하여 간 영역을 추출하기 위해서 간의 형태학적 정보 그리고 명암도와 명암의 분포도를 이용한 양자화 기법 등을 적용하여 추출하며 추출된 간 영역에서 간암의 후보 영역 추출은 간암의 명암도와 형태학적 특징 정보를 이용하여 추출한다. 본 논문에서는 간암의 추출을 위해 맵 상에 흩어져 분포되어 있는 유사 패턴들의 무게 중심을 찾아 하나의 패턴으로 그룹화 하는 개선된 SOM 알고리즘을 제안하여 간암 판별에 적용한 후, 기존의 SOM 알고리즘과 비교 분석한 결과. 본 논문에서 제안된 SOM 알고리즘을 적용한 간암 추출이 더 효율적임을 확인 할 수 있었으며, 전문의가 판별한 것과 비교 분석한 결과, 전문의를 보조할 수 있는 보조 전문가 시스템으로서의 가능성을 확인할 수 있었다.

• Journal of Chest Surgery
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• v.31 no.10
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• pp.988-994
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• 1998

Background: Chest wall tumors can classified into soft tissue tumors and bone tissue tumors and can be subclassified into benign and malignant tumors. Materials and methods: We report an analysis of 68 patients with primary chest wall tumors treated at the department of thoracic and cardiovascular surgery at Hanyang University Hospital from January, 1973 to September 1997. Results: Among a total of 68 patients 33(48.5%) were males and 35(51.5%) were females. The ages of the patients ranged from 10 to 79 years with a mean age of 39.3 years. According to the age distribution, 23 patients (33.8%) were from the 4th decade, 12 patients(17.6%) were from the 6th decade, and 10 patients(14.7%) were from the 5th decade. Among the primary chest wall tumors, 53 cases were benign and 15 cases were malignant. Among the benign tumors, 17 cases(32.1%) were in the 4th decade and among the malignant tumors, 6 cases(40%) were in the 4th decade. In both malignant and benign tumors the most common ages were in the 4th decade. The most common tumors were fibrous dysplasia and chondroma, each with a total of 14 cases(26.4%). Osteochondroma and lipoma each had 8 cases(15.1%). Among malignant tumors, osteosarcoma was most common with 8 cases (53.3%). According to location, 49 cases occured in both bone and cartilage tissue, 19 cases occurred in cartilage. Among the presenting symptoms, palpable mass was present in all cases. Fifty-one patients complained of tenderness and among cases with involvement of the lung, 3 patients had complained of respiratory distress. Among the malignant tumors 6 cases underwent a radical operation and 4 cases of benign tumors underwent a radical operation. Postoperativly, there was one case with recurrence from a desmoid tumor. There were no deaths postoperativly and no deaths due to complications(and their postoperative courses were uneventful). Conclusions: Most patients with primary chest wall tumors initially present with mass at admission. Resection is sufficient treatment for benign tumors but in malignant tumors wide resection of the chest wall is needed and mchest wall reconstruction.

• Journal of Chest Surgery
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• v.30 no.4
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• pp.462-466
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• 1997

Primary mediastinal choriocarcinoma is characteristically seen in young males presenting with the symptomes of cough, chest pale, and gynccomastia. A 33-year-old woman was admitted to the hospital because of severe dyspnea and chest pain which was aggravated rapidly 2 or 3 days ago. Posterior mcdiastinal mass measuring about 1 cm in diameter was seen in Chest P-A, left lateral view of chest, and chest CT. Serum $\beta$-HCG level was markedly elevated up to 200, 000 mIxt. Whole body CT and other studies could not find any lesion on ovary and uterus. But, a single nodule nEeasuring about 1 cm in diameter was identified in the brain CT. The tumor cells (syncytiotrophoblastic cells) from resected mass revealed positivity on i histochemical staining for $\beta$-HCG. She was treated with EMA-CO after resection of tumor, But, 7 months later, she was readmitted and showed cerebral hemorrhage due to metastatic choriocarcinoma. She was operated again for the brain tumor, and was doing well for further 7 months.

• Journal of Chest Surgery
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• v.39 no.4 s.261
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• pp.332-334
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• 2006

Inflammatory myofbroblastic tumor in the lung is a rare tumor. The etiology is not clear. This tumor in children is a benign tumor rarely presented with local invasiveness, recurrence, distant metastasis or malignant changes can occur. The complete surgical resection is chosen as the optimal management. A 12-years-old boy visited the outpatient clinic with a 4 cm sized pulmonary mass in left upper lung field. The patient underwent left upper lobectomy. Histopathologically, inflammatory myofibroblastic tumor was confirmed. The patient was discharged without any problems and there was no evidence of recurrence during 3 months follow-up.

• Journal of Chest Surgery
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• v.32 no.2
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• pp.211-214
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• 1999

We experienced a case of thymolipoma that is a rare benign mediastinal tumor, composed of normal thymic tissue and matured adipose tissue. A 46-years-old woman was admitted to the department of medicine due to lower abdominal pain. Simple chest PA showed a large mass shadow at right cardiac border. Chest CT scanning showed well defined large fatty mass at right cardiac border which was suggested thymolipoma. The mass was resected and confirmed as thymolipoma histopathologically.

• Journal of Chest Surgery
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• v.36 no.9
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• pp.699-702
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• 2003

Endoscopic removal is acceptable for the treatment of endotracheal/endobronchial mass, because it is less invasive in high-risk patients and a conservative procedure for benign tumors. Two benign tumors in the lumen of the trachea (pure lipoma) and in the intermediate bronchus (hamartoma) were completely eradicated by our procedures, which involved diathermic snaring and residual mass removal with biopsy forceps under the guidance of fiberoptic bronchoscopy. No tumor recurrence was evident after extended follow-up (6 years for endotracheal lipoma and 2.5 years for endobroncheal hamartoma). Our method is safe and less invasive for the patient and provides the surgeon with better view during procedure.

• Journal of Chest Surgery
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• v.40 no.12
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• pp.878-881
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• 2007

Pneumocephalus after thoracoscopic excision of a mediastinal mass is a very rare complication. It presumably occurs due to dural injury near the spinal root and development of a subsequent subarachnoid-pleural fistula. A 60-year-old woman complained of nausea and headache after thoracoscopic excision of a posterior mediastinal mass. She was diagnosed with pneumocephalus by brain CT and recovered with supportive management.

• Journal of Chest Surgery
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• v.29 no.1
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• pp.125-128
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• 1996

The primary mediastinal liposarcoma is a very rare tumor. It mainly causes respiratory symptoms, but can be asymptomatic. The most favorable treatment of primary mediastinal liposarcoma is a surgical removal, whether it is complete or not, regardless of the size or histologic type of the tumor. The survival is determined by the histologic type of tumor. A 34-year- ld man was admitted because of asymptomatic mediastinal tumor which was progressively growing over 6 years. The tumor was completely resected and the microscopic findings of the tumor were compatible with well-differentiated liposarcoma. The patient recovered and discharged without complication on the 7th postoperative day.

• Journal of Chest Surgery
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• v.42 no.5
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• pp.666-669
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• 2009

Calcifying fibrous pseudotumors (CFP) are rare soft tissue tumors that have unique histopathologic features characterized by a dense hyalinized collagenous tissue interspersed with benign spindle cells, lymphoplasmacytic infiltrate, and psammomatous or dystrophic calcifications. We report here on a case of calcifying fibrous pseudotumors in the pleura and provide a literature review.

• Journal of Chest Surgery
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• v.41 no.4
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• pp.496-498
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• 2008

Cardiac papillary fibroelastomas are the second most common primary cardiac tumor. This tumor is usually benign and it involves the cardiac valve. However, most cardiac papillary fibroelastomas originate from a single site, and the incidence of cardiac papillary fibroelastomas originating from multiple sites is very rare (5%). A 55-year-old woman who presented with momentary dizziness and syncope was evaluated by performing echocardiography. Multiple tumors attached to the aortic valve were noted. The mass was removed freely without leaving any defect on the aortic valve leaflet. After the recovery period, the patient is currently being followed up at the outpatient department.