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1/68. Tumor-induced osteomalacia and symptomatic looser zones secondary to mesenchymal chondrosarcoma.

    Tumor-induced osteomalacia is a rare clinical entity that is associated with soft-tissue or skeletal tumors. We present a case report of a patient with a chest wall mesenchymal chondrosarcoma who presented with bone pain. The patient had skeletal changes in the femoral neck and fibula consistent with osteomalacia and laboratory values suggesting phosphate diabetes. The patient was treated with tumor resection and phosphate supplementation with reversal of the signs and symptoms of osteomalacia. Tumor-induced osteomalacia is vitamin-D-resistant and often reversed by complete removal of the tumor. Most commonly, the causative tumors are of vascular, mesenchymal, or fibrous origin. The osteomalacia is associated with bone pain, muscle weakness, and radiographic changes. Tumor-induced humoral factors have been implicated in causing the osteomalacia, but the definite etiology has yet to be determined. Current treatment includes complete tumor resection and electrolyte supplementation. ( info)

2/68. Mesenchymal extraskeletal chondrosarcoma of the orbit. Report of a case and review of the literature.

    BACKGROUND: Extraskeletal mesenchymal chondrosarcoma (MCS) is relatively uncommon. Orbital location is extremely rare: only 16 cases have been reported until now. We report a case of extraskeletal mesenchymal chondrosarcoma in a 27-year-old man and review the literature on its manifestations and management. CASE REPORT: This patient had a 2-year history of progressive proptosis of the right eye. skull X-ray and CT scan showed intraorbital calcification and a large lesion in the upper right orbit. He was operated three times because of recurrence of the tumor. The last recurrence was observed to have extension to the intracranial region, detected on MRI and CT scan. This secondary extension of the tumor to the intracranial region has not been previously reported. Immunohistochemical analysis for S-100 protein showed focal positivity. CONCLUSION: Mesenchymal chondrosarcoma of the orbit is rare, and secondary extension to the intracranial region has not previously been reported. ( info)

3/68. A case of ruptured mesenchymal chondrosarcoma of the pancreas.

    A 25-year-old woman who underwent surgical removal of a right frontal meningeal mesenchymal chondrosarcoma in 1980 manifested abdominal pain and progressive anemia after a traffic accident in April 1997. CT disclosed a well-enhanced solid mass 2.5 cm in diameter with internal calcific deposits at the tail of the pancreas and a surrounding hematoma of 5.5 cm in diameter. Surgical resection revealed a ruptured metastatic mesenchymal chondrosarcoma of the pancreas. ( info)

4/68. A case of soft tissue mesenchymal chondrosarcoma metastatic to skin, clinically mimicking keratoacanthoma.

    We report the first case of metastatic involvement of the skin by a soft tissue mesenchymal chondrosarcoma (MS). A 64-year-old man presented 15 months after resection of a 7.0 cm MS from his left forearm with a rapidly growing, erythematous nodule on the left side of the upper lip. The lesion was clinically interpreted as a keratoacanthoma. The histologic appearance was identical to that of the soft tissue MS; an immunohistochemical stain for CD99 was positive. lung and bone metastases were subsequently documented. Our case expands the differential diagnosis of malignancies with cartilaginous differentiation that can involve the skin. ( info)

5/68. Abdominal calcifications in mesenchymal chondrosarcoma: case report and review of the literature.

    Mesenchymal chondrosarcomas are rare malignant cartilaginous tumors arising either in bones or in extraosseous sites. Their diagnosis is essentially based on medical imaging and pathological analysis. Despite heavy treatment, their prognosis remains extremely poor. ( info)

6/68. Parapharyngeal space mesenchymal chondrosarcoma in childhood.

    A case of extra osseous mesenchymal chondrosarcoma occuring in the parapharyngeal space in a 7-year-old girl, is being presented for its rarity. It is a slow growing, locally aggressive tumour with a high incidence of local recurrence as well as distant metastasis. It is rare in the pediatric age group and rarer in the parapharyngeal space. It has a poor prognosis, the 5-year survival rate varies between 30 and 50%. Radical surgery is the treatment of choice. radiotherapy and chemotherapy have an adjuvant role. More experience with this tumour is required to evaluate the most effective treatment. Current literature on this subject has been reviewed. ( info)

7/68. Intracranial extraskeletal mesenchymal chondrosarcoma: case report.

    OBJECTIVE AND IMPORTANCE: We present a patient with a dural-based intracranial extraskeletal mesenchymal chondrosarcoma, which was initially thought to be an atypical meningioma. This rare tumor should be considered in the differential diagnosis of young adults with an aggressive-appearing dural-based lesion. CLINICAL PRESENTATION: A 21-year-old woman reported a 3-week history of severe headaches and intermittent nausea and vomiting. Neurological examination revealed right optic nerve swelling. magnetic resonance imaging demonstrated a large, intensely enhancing extra-axial mass, which appeared to originate from the right side of the falx cerebri with significant mass effect. A presumptive diagnosis of meningioma was made. INTERVENTION: The patient underwent preoperative embolization of the lesion and then underwent a bicoronal craniotomy, gross total resection of the tumor, removal of invaded calvarial bone, and cranioplasty. Pathological examination revealed an extraskeletal mesenchymal chondrosarcoma. Because of the potential for recurrence, the patient received subsequent radiotherapy. She remains free of recurrence 18 months after surgery. CONCLUSION: Intracranial mesenchymal chondrosarcoma is a rare neoplasm that can mimic a meningioma radiographically. We present the first patient in whom this lesion has been documented with computed tomography, cardiography, magnetic resonance imaging, and pathological findings. We emphasize the importance of gross total resection and close follow-up for this potentially aggressive tumor, and we present a review of the literature. ( info)

8/68. Mesenchymal chondrosarcoma of the sacrum: a case report and review of the literature.

    The authors present a case of mesenchymal chondrosarcoma located in the sacrum of a 23-year-old patient treated with radiotherapy and chemotherapy. A review of the literature on the topic is also reported. ( info)

9/68. Extraskeletal mesenchymal chondrosarcoma involving the heart: report of a case.

    Extraskeletal mesenchymal chondrosarcoma is a rare tumor frequently arising in the meninges and lower limbs. We describe a case of mesenchymal chondrosarcoma involving the heart in a 39-year-old man who presented with fever, chest pain and shortness of breath. His clinical course was rapid, leaving insufficient time for a complete diagnostic work-up, and the patient died 2 months after the onset of symptoms. ( info)

10/68. Mesenchymal chondrosarcoma of the maxilla.

    Mesenchymal chondrosarcoma (MC) is a rare tumour, with a predilection for the head and neck region. We describe a case of mesenchymal chondrosarcoma arising in the right maxilla extending to the basi-sphenoid. Its computed tomography (CT) and magnetic resonance imaging (MRI) and histopathological features and the management are presented. We also reviewed the literature of reported cases involving the maxilla. ( info)
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