• Journal of Korean Neurosurgical Society
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• v.30 no.9
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• pp.1127-1129
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• 2001

The vast majority of schwannomas occur on cranial nerves, and rarely in the retroperitoneum. Solitary schwannoma in the psoas muscle is extremely rare. The authors present a case of retroperitoneal neoplasm in the psoas muscle identified as schwannoma which is not associated with von Recklinghausen's disease. A 68 years old female patient was admitted because of low back pain and weakness at the left leg. CT and MRI revealed a large cystic mass with well-defined margin and multiple internal septation within the left psoas muscle. The tumor was totally extirpated and histologically confirmed as a schwannoma.

• Journal of the Korean Society of Radiology
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• v.82 no.1
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• pp.219-224
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• 2021

Leiomyosarcoma (LMS) is a soft tissue sarcoma that originates from smooth muscle cells. It is commonly found in the uterus but can occur throughout the body, including the retroperitoneal space, abdominal cavity, and any vascular structure. Although there are many case reports of uterine or vascular LMS metastasizing to the heart, cardiac metastasis from nonvisceral lesions has only been reported in two cases. Herein we report a rare case of a patient presenting metastatic LMS from the left flank in the right ventricle observed with echocardiography and enhanced computed tomography.

• Advances in pediatric surgery
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• v.9 no.2
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• pp.94-97
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• 2003

The teratoma is a unique complex neoplasm and is one of the most frequent pediatric tumors originated from the extragonadal germ cells. Mature teratoma is composed of mature differentiated tissues, while immature teratoma always contains embryonic tissues of variable degrees of immaturity, especially in the neuroepithelial elements. Diagnosis of teratoma is relatively easy by conventional radiologic study, but the immaturity can be identified only by histopathological examination. Between January 1993 to December 2002, 63 cases of teratoma were operated and analysed retrospectively at the Chonnam University Hospital Female to male ratio was about 3:1 and age distribution was relatively even. Among 63 cases, gonadal teratoma was the most common (52.4%), followed by sacrococcygeal (25.4%), retroperitoneal (9.5%) and mediastinal teratoma (9.5%). Fifty-six cases were mature teratomas and seven were immature teratomas. Alpha-fetoprotein (AFP) was elevated in 4 of 6 immature cases, but in 2 of 51 mature ones Elevated AFP progressively returned to normal range by 1 month after operation in all. Complete excision of the mass was performed, and major complication was not noticed. In five immature cases, PEB chemotherapy (Cisplatin, Etoposide, Bleomycin) was performed. Two of 2 cases in histological grade II were well tolerated to the aggressive chemotherapy. One of three cases in grade III expired due to severe bone marrow depression, and two of them expired by tumor recurrences. In conclusion, immature teratoma in histological grade III showed high potentiality of recurrence. Therefore, postoperative chemotherapy has to be applied to the high graded immature tumors.

• Radiation Oncology Journal
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• v.37 no.3
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• pp.224-231
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• 2019

Purpose: To investigate the patterns of recurrence in patients with neuroblastoma treated with radiation therapy to the primary tumor site. Materials and Methods: We retrospectively analyzed patients with high-risk neuroblastoma managed with definitive treatment with radiation therapy to the primary tumor site between January 2003 and June 2017. These patients underwent three-dimensional conformal radiation therapy or intensity-modulated radiation therapy. A total of 14-36 Gy was delivered to the planning target volume, which included the primary tumor bed and the selected metastatic site. The disease stage was determined according to the International Neuroblastoma Staging System (INSS). We evaluated the recurrence pattern (i.e., local or systemic), progression-free survival, and overall survival. Results: A total of 40 patients with high-risk neuroblastoma were included in this study. The median patient age was 4 years (range, 1 to 11 years). Thirty patients (75%) had INSS stage 4 neuroblastoma. At the median follow-up of 58 months, there were 6 cases of local recurrence and 10 cases of systemic recurrence. Among the 6 local failure cases, 4 relapsed adjacent to the radiation field. The other 2 relapsed in the radiation field (i.e., para-aortic and retroperitoneal areas). The main sites of distant metastasis were the bone, lymph nodes, and bone marrow. The 5-year progression-free survival was 70.9% and the 5-year overall survival was 74.3%. Conclusion: Radiation therapy directed at the primary tumor site provides good local control. It seems to be adequate for disease control in patients with high-risk neuroblastoma after chemotherapy and surgical resection.