• Proceedings of the KACD Conference
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• 2003.11a
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• pp.591-591
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• 2003

Apical periodontitis is inflammation of the periodontium caused by infection of the pulp canal system. Moreover, a dental periradicular lesion occurs as a periradicular tissue reaction to bacterial infection and consists of periradicular inflammation with alveolar bone destruction and root resorption, a consequence of the interaction between oral flora and the existing host defenses. Many investigations dealing with the pathogenesis and history of periradicular lesions have described histologically, immunologically, biochemically the development of the periradicular lesion；but none of these studies have shown any correlation between this lesion and several factors, the whole body disease in the worldwide.(omitted)

• Journal of Trauma and Injury
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• v.34 no.1
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• pp.75-78
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• 2021

A Morel-Lavallée lesion is a post-traumatic closed degloving soft tissue injury after blunt trauma. Infection and skin necrosis frequently occur if it is not treated properly in the early stages. However, there is no clearly established treatment algorithm. In the acute stage, it is mainly treated with aspiration, simple compression, and incisional drainage. In the chronic stage, sclerotherapy is usually performed. If skin necrosis develops, the necrotic tissue is resected and a skin graft is needed. We describe a case of acute Morel-Lavallée lesion in the buttock region that was treated with limited incisional drainage and negative-pressure wound therapy, and also present a review of the literature.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.16 no.1
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• pp.60-79
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• 2022

The U-Net architecture-based segmentation models attained remarkable performance in numerous medical image segmentation missions like skin lesion segmentation. Nevertheless, the resolution gradually decreases and the loss of spatial information increases with deeper network. The fusion of adjacent layers is not enough to make up for the lost spatial information, thus resulting in errors of segmentation boundary so as to decline the accuracy of segmentation. To tackle the issue, we propose a new deep learning-based segmentation model. In the decoding stage, the feature channels of each decoding unit are concatenated with all the feature channels of the upper coding unit. Which is done in order to ensure the segmentation effect by integrating spatial and semantic information, and promotes the robustness and generalization of our model by combining the atrous spatial pyramid pooling (ASPP) module and channel attention module (CAM). Extensive experiments on ISIC2016 and ISIC2017 common datasets proved that our model implements well and outperforms compared segmentation models for skin lesion segmentation.

• Imaging Science in Dentistry
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• v.53 no.3
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• pp.239-245
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• 2023

Schwannomas are uncommon neoplasms of neurologic origin that are rare in the salivary glands. A schwannoma that persists for a long time is referred to as an ancient schwannoma if it is accompanied by degenerative changes on histology. The case described herein involved a 37-year-old man with an ancient schwannoma that had persisted for 20 years in his right parotid gland. Clinically, the lesion presented with swelling and pain. Computed tomography revealed a well-defined, multilocular enhanced lesion. T2-weighted magnetic resonance images displayed multilocular hyperintensity, while T1-weighted images showed a high signal at the lobulated margin and a homogeneous low signal internally. The preoperative diagnosis, based on the lesion's location and imaging diagnosis, was Warthin's tumor. However, a biopsy conducted after surgical excision identified the lesion as a schwannoma with cystic degeneration. This report also presents a summary of the characteristics of rare cases of schwannoma in the major salivary gland based on this case and a literature review.

• Journal of Veterinary Clinics
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• v.39 no.1
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• pp.23-27
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• 2022

An 11-year-old spayed female Maltese dog presented with mass in oral cavity. On conscious oral examination, the right maxillary canine tooth was not visible, and a lesion has been suspected of mass existed in canine tooth area. The adjacent maxillary first premolar was buried in the lesion, with a little part of the tooth exceptions. On radiographic examination, the canine tooth was buried horizontally in the lesion, and the root part was adjacent to the first premolar tooth. Extraction was performed for a treatment. When the lesion was incised, the canine tooth was horizontal with the concave surface facing the palatal, and formed double teeth by fusing with the premolar tooth at the roots parts of the teeth. This report described the double teeth in the dentigerous cyst rarely reported in dogs.

• The Academic Congress of Korean Shoulder and Elbow Society
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• 1997.05a
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• pp.35-36
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• 1997

• The Academic Congress of Korean Shoulder and Elbow Society
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• 2001.03a
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• pp.24-25
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• 2001

• Imaging Science in Dentistry
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• v.30 no.2
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• pp.127-131
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• 2000

A 19-year-old man was referred to Seoul National University Dental Hospital for evaluation of a large painless swelling of the left mandibular angle area in August, 1999. The growth had been first noted 6 years ago. He had visited other hospital in 1997. In spite of the treatment given at the hospital, the mass continued to grow rapidly. Conventional radiographs in 1999 showed an expansile, lobulated, and destructive lesion of the left mandibular body. CT scan demonstrated an expansile mass with a corticated margin. Bony septa were seen within the lesion. Internal calcification noted on the bone-setting CT image, and corresponded to the hypointense area in T1-weighted MRI image. MRI clearly delineated the extent of the lesion which had heterogenous intermediate signal intensity in T1-weighted images and heterogenous hyperintense signal intensity in T2-weighted images. The lesion was well-enhanced. Histopathologically, the lesion was well demarcated. Multinucleated giant cells were presented in a fibrous background, demonstrating a storiform pattern. Areas of osteoid rimmed by a few osteoblasts were scattered throughout the lesion. Inflammatory cells, blood vessels, and hemosiderin deposition were also shown. CGCG may show lots of internal calcification foci on the CT, and varied signal intensity in MRI. More cases will be needed to understand the features of the CT & MR finding of CGCG.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.27 no.4
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• pp.346-349
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• 2005

Metastatic tumours to oral soft tissue are uncommon and accounts for approximately 1% of malignant oral neoplasms. Because of its rarity and clinical appearance of benign nature, the diagnosis of a metastatic lesion in the oral soft tissue may be challenging, both to clinicians and pathologists. We analyzed the clinical data of 9 patients who had metastatic carcinoma to oral soft tissues. The metastatic site to oral soft tissue was the gingiva in all cases. The most common primary site was lung (6 cases) followed by liver (2 cases) and breast (1 case). The clinical appearance resembled gingiva hyperplasia, pyogenic granuloma or gingival swelling. In one case, the metastatic gingiva lesion was found before detection of primary cancer. The mean survival time after diagnosis of metastatic lesion was 3 months. Although this metastatic lesion is rare, oral and maxillofacial surgeon should recognized that benign inflammatory lesion may be the metastatic malignant lesion or the first sign of undiagnosed underlying malignancy.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.32 no.5
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• pp.484-487
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• 2010

Cemento-ossifying fibroma is a true osteogenic neoplasm. It is also called as ossifying fibroma or cementify-ing fibroma. Small lesions seldom cause any symptoms and are detected only on radiographic examination. Large lesions result in a painless swelling of the involved bone. In radiographic features the lesion most often is well defined and unilocular. It may appear completely radiolucent, or more often varying degrees of rdiopacity. It is composed of fibrous tissue that contains a variable mixture of bony trabeculae,cementum-like spherules, or both. Treatment of most lesions generally is enucleation of tumor. However, some lesions which have grown large and destroyed considerable bone, may necessitate surgical resection and bone grafting. This case was the bony lesion that was found by accident in patient with mandibular left body and subcondylar fracture. In radiographic examination, there was a mixed radiolucent and radiopaque lesion in mandibular left body area with fracture line. We treated on mandibular left body and subcondylar fracture and enucleated the lesion on the left body area simultaneously. At surgical exploration, the lesion was well demarcated from the surrounding bone, thus permitting relatively easy separation of the tumor from its bony bed. In histopathologic examination, the lesion contained bony trabeculae and cementum-like spherules within a background of cellular fibrous connective tissue. It finally diagnosed as cemento-ossify-ing fibroma from the result of biopsy.