• The Journal of the Korean bone and joint tumor society
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• v.5 no.1
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• pp.56-62
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• 1999

Purpose : This study was conducted to analyze the clinical materials and treatment results of 13 cases of subungual exostosis. Materials and Methods : Thirteen subungual exostoses of the foot treated from January 1991 to December 1997 were studied. We analyzed the clinical data and results of treatment to identify the clinical characteristics of this disease. We investigated the location, shape and relation of exostosis to phalanx with simple x-ray of the foot to identify the radiological characteristics. All the cases were sent to pathologic examination after resection to determine the pathological characteristics. Results : The results of physical examination on presentation were various. Most cases were located at the dorsomedial side of the distal phalanx and were involved in the toe nail. Eleven cases were located at great toes and one each at the 2nd and 3rd toe. Causes of exostosis were not clear, but 2 cases were related to trauma. For the type of exostosis, 7 cases were sessile and 6 were stalk type. On histologic examination, 9 cases showed a cartilaginous portion with overlying proliferating fibrous tissue and underlying bone formation. There was a gradual maturation of spindle cell proliferation from cartilage to cancellous bone. The cartilage was moderately cellular with some pleomorphism, but true anaplasia was not present. Conclusion : The clinical presentation and findings of simple x-rays were most helpful in diagnosing subungual exostosis. Complete excision of the mass achieved complete relief of symptoms and recovery without recurrence in all cases.

• The Journal of the Korean bone and joint tumor society
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• v.12 no.1
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• pp.52-56
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• 2006

There are some malignant changes in multiple osteochondroma to chondrosarcoma, but secondary chondrosarcomas rarely develop in 1~2% of patients with solitary osteochondromas. Chondrosarcomas of the bones of hands and feet are rare, in comparison with their occurrence at other sites. The calcaneus was most commonly involved in the feet, but malignant transformation of solitary osteochondroma of the calcaneum to chondrosarcoma is extremely rare. We report one case of solitary calcaneal mass that grows slowly without pain from 6 years ago. He was 38 aged old man and surgical excision of the mass revealed chondrosarcoma arising from osteochondroma of the calcaneum.

• The Journal of the Korean bone and joint tumor society
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• v.12 no.1
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• pp.57-62
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• 2006

Giant cell tumors are potentially malignant tumors in vertebrae, affecting frequently difficult to diagnose and are often inoperable. So it will be treated using radiation because of their high recurrence rate and the mechanical compression of spinal cord, but many surgeons described tumors of the vertebra, and the affected vertebral body can be treated using radical or near to total excision, with anteroposterior vertebral fusion or instrumentation of the spine. we report a case of giant cell tumor affecting the third cervical vertebra which caused neck pain and destroyed the vertebra body had treated using radical excison with fusion of posterior arch using instrumentation of the spine together with a literature review.

• The Journal of the Korean bone and joint tumor society
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• v.14 no.1
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• pp.62-67
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• 2008

Malignant degeneration of fibrous dysplasia is rare and involves transformation into osteosarcoma, fibrosarcoma and chondrosarcoma. The most frequent sites involved in malignant transformation were craniofacial bones, proximal femur, humerus, pelvis, tibia and scapula in a decreasing order of frequency. An 41-year-old man with a history of polyostotic fibrous dysplasia presented with increasing left arm pain. Plain radiograph showed expansile destructive lesion along the humeral shaft. As initial biopsy report was low grade chondrosarcoma, he underwent marginal resection. However, he developed local recurrence 7 month later and subsequent pathologic finding was chondroblastic osteosarcoma. We report one case of secondary chondroblastic osteosarcoma from polyostotic fibrous dysplasia initially misdiagnosed as low grade chondrosarcoma that caused fallacy in treatment strategy.

• The Journal of the Korean bone and joint tumor society
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• v.15 no.2
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• pp.151-154
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• 2009

Bronchogenic cyst is rare lesion that arises from maldevelopment of the primitive foregut, and is usually found in the lung and mediastinum. Cutaneous or subcutaneous bronchogenic cyst is rare and occur unusually in the shoulder region. We report here a case of 20-month-old boy with a bronchogenic cyst on his left shoulder region. He underwent incisional biopsy and curettage for a tender cystic mass at a department of dermatology, diagnosed as a epidermal inculsion cyst. But, additional cystic mass was palpated during wound care. MRI showed a well-defined subcutaneous cystic mass. The excised cyst was lined with pseudostratified ciliated columnar epithelium with occasional goblet cells and diagnosed as a bronchogenic cyst.

• The Journal of the Korean bone and joint tumor society
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• v.1 no.2
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• pp.210-219
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• 1995

Many different factors which may affect the prognosis of the soft tissue sarcomas have been reported by many authors ; Generally, tumor size, histologic type, surgical margin, and multi modality therapy therapy as the prognostic factors were reported. The objectives of this retrospective study of soft tissue sarcomas are : 1) to define more clearly prognostic variables that have significant predictive value for disease-free and overall survival ; and 2) to evaluate tumor histologic grade based upon extent of tumor necrosis as a means of stratifying more aggressive soft tissue sarcomas(grade II & III) of the extremities. We treated 94 patients who had soft tissue sarcoma of the extremities and trunk from May 1984 to September 1994(average duration of follow-up was 5 years ranging from 2 months to 10 years) and evaluated the prognostic factors of the soft tissue sarcomas; age, sex, depth, size, location, histologic type and grade, stage, therapy modality, surgical margin, local recurrence and distant metastasis. The results were as follows. 1. The patients with poorer prognosis were over the age of fifty, whose mass was deeply located, size of the mass was over 10cm in diameter, grade III in histology, who had local recurrence, metastasis, and received only surgery. 2. Among these prognostic factors, the most significant prognostic factor was histologic grade base upon extent of tumor necrosis.

• The Journal of the Korean bone and joint tumor society
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• v.1 no.2
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• pp.200-204
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• 1995

Twenty three rhabdomyosarcoma patients who were registered in Korea Cancer Center Hospital from Mar. 1985 to Apr. 1994 were analysed in the aspect of treatment and survival. Thirteen cases were male and 10 female. Average age was 29.5 years(range 1 to 66). Locations of the tumor were as follows: 13 in lower extremity, 6 in upper extremity and 4 in trunk. According to the UICC classification, stage II b was 1 case, stage III a 4, stage III b 10, stage IV a 3 and stage IV b 5. In histological categories, embryonal rhabdomyosarcoma was 7 cases, alveolar 7, pleomorphic 7 and undetermined 2. Average follow up period was 35.3 months(1 tk 7.5 years). Ten cases were continuous disease free, 3 no evidence of disease, 3 alive with disease and 7 died of disease at final follow up. Kaplan-Meier's actuarial 5-year survival rate was 60.3% and 5-year continuous disease free survival rate was 31.4%, Surgical margin was an important factor in local tumor control. Although there was no definite statistical significance, our results suggest chemotherapy and radiation therapy have meaningful roles in reducing local recurrence and improving survival.

• The Journal of the Korean bone and joint tumor society
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• v.1 no.2
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• pp.194-199
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• 1995

To evaluate the role of post-operative irradiation in reducing local recurrence after surgical treatment of liposarcoma, 19 patients who were treated between July 1988 and June 1994 at Department of Orthopedic Surgery, Catholic University were studied retrospectively. The average follow up was 31 months. 1. There were 14 males and 5 females and an average age was 51 years old. 2. Thirteen cases were in extremities and buttock, 3 in neck, 2 in retroperitoneum and 1 in back. 3. Histologic types were 16 cases of myxoid type and 3 cases of well differentiated type. 4. Ten cases were achieved with wide margin and 9 with inadequate(intralesional or marginal) margin. 5. There were no local recurrence in 10 cases with wide margin, whereas 6(67%) local recurrences in 9 cases with inadequate margin. 6. Among 6 cases of local recurrence, 5 cases had been treated with post-operative irradiation. In conclusion, post-operative irradiation for inadequate margin(intralesional or marginal margin) was not sufficient to reducing local recurrence.

• The Journal of the Korean bone and joint tumor society
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• v.1 no.2
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• pp.164-170
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• 1995

Eight patients with Ewing's sarcoma were treated between September 1983 and September 1992 at medical college, Department of Orthopaedic Surgery, Guro Hospital, Korea University. There were 5 males and 3 femails, with mean age of 28.2 years(ranging from 2-66 years). Three patients with soft tissue Ewing's tumor were excluded from the study. Of the eight patients, two patients presented with multiple metastasis, two cases occurred in the rib, and in the distal femur, mandible, scapular, 3rd, 4th thoracic spine in each patients. Chemotherapy alone was applied in 3 patients, radiotherapy alone in 1 patient, 2 patients were treated with chemotherapy and radiotherapy. Four patients died from the disease itself. Remissions were achieved in the other 4 patients. However, among them two patients relapsed 5 and 36 months later, I patient was not able to be followed, I patient died due to sepsis. The poor prognosis observed for patients with axial lesions should encourage other methods of managing these tumors.

• The Journal of the Korean bone and joint tumor society
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• v.10 no.1
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• pp.56-60
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• 2004

A bone island represents a focus of mature compact bone within the cancellous bone. It can be diagnosed based on characteristic clinical and radiologic features. The lesion is typically asymptomatic with a preference for the pelvis, femur, and other long bones. On the radiologic study, the lesion appears as an ovoid, round, or oblong homogeneously dense and sclerotic focus in the cancellous bone. Characteristic feature of this lesion is radiating bony streaks, known as "thorny radiations" or "pseudopodia". Most bone islands are small, and majority of the lesions measure from 0.1 to 2.0 cm. Giant bone island, defined as a diameter greater than 2 cm, has been rarely reported in the literature. We report a case of giant bone island measured by 10${\times}$1.7${\times}$1 cm in the diaphysis of right tibia in 31-year-old man.