eMedicine Specialties > Thoracic Surgery > Tumors
Lymphomas, Endocrine, Mesenchymal, and Other Rare Tumors of the Mediastinum: Follow-up
Updated: Jan 29, 2009
Outcome and Prognosis
Prognosis after resection of a mediastinal tumor varies widely depending on the type of lesion resected.
After resection of mediastinal cysts and benign tumors, prognosis is generally excellent. This group of tumors includes such neoplasms as thymolipomas; benign mesenchymal tumors such as fibromas, angiomas, and lymphangiomas; ectopic benign thyroid tissue, including intrathoracic extension of a cervical goiter; and parathyroid adenomas.
Prognosis after treatment of malignant mediastinal tumors depends on the type of lesion, its biological behavior, and the extent of the disease present.
Mediastinal lymphomas
Excellent survival rates are reported with appropriate chemotherapeutic treatment of Hodgkin disease. According to some reports, even patients with stage IV disease can have disease-free survival for more than 10 years in as many as 70% of cases.
Large cell lymphomas, including anaplastic varieties, are reported to have a more than 50% 3-year survival rate after chemotherapy, radiation therapy, or both.
MALTomas are rare indolent tumors for which long-term survival is good, even in the absence of chemotherapy.
Mantle cell tumors are rare but usually manifest with widespread disease. Median survival is approximately 4 years.
Malignant mesenchymal tumors
The prognosis for liposarcoma depends on several factors. Completely resected pseudoencapsulated tumors have a better prognosis compared to those that are nonencapsulated and invasive. Cell type and cell differentiation also play a role. Myxoid liposarcoma has a poorer prognosis. In one small series, approximately 30% of patients died of their disease after a mean period of less than 3 years.
Angiosarcomas of the mediastinum are rare but have a very poor prognosis, especially when they originate in the heart or great vessels.
Fibrosarcomas have a uniformly poor prognosis, and most patients die from their disease within a few years.
Primary leiomyosarcoma of the mediastinum has been described. In one reported series of 10 patients who underwent resection, 2 were alive and well at 4 and 6 years. Four of the others died of their disease or developed recurrence.
Rhabdomyosarcoma has the best long-term survival of all mesenchymal tumors because effective chemotherapeutic regimens have been identified. According to 1 report, 10-year actuarial survival rates range from 52-83% depending on the stage of disease at presentation and the existence of hematogenous metastases. Survival is much worse if the latter is present.
Mediastinal parathyroid carcinoma
Prognosis is generally good if complete resection can be accomplished.
Intrathoracic goiter with occult malignancy
Prognosis is generally good if complete resection of the gland can be accomplished.
Future and Controversies
A number of exciting advances have been made in areas of diagnostic imaging, biologic analysis, and therapy.
Emerging diagnostic modalities, such as PET scans, and other radionuclide studies may be able to assist in the diagnosis of specific neoplasms and in posttherapy surveillance for recurrent disease.29
Angiographic techniques using localized intra-arterial injection of hypertonic contrast and embolization techniques have been used in several centers to obliterate mediastinal parathyroid adenomas. At present, this technology is used in patients who are considered a poor risk for surgery; however, with increased experience and skill, these methods may become useful in the treatment of many such lesions.
Numerous biological markers have been identified for many tumors and will play a vital role in better identifying individual neoplasms so that treatment can be optimized.
Use of video-assisted thoracoscopy (VATS) technology has entered the armamentarium of the thoracic surgeon with respect to the treatment of a number of mediastinal diseases. This modality is already used commonly for biopsy of masses and lymph nodes. It has also been described for resection of various mediastinal cysts, mediastinal parathyroid adenomas, and localized benign tumors of the posterior mediastinum, such as ganglioneuromas. At several centers, thymectomy has been performed using this technology. The completeness of thymic resection remains to be seen.
The authors and editors of eMedicine gratefully acknowledge the contributions of previous author Jane M Eggerstedt, MD, to the development and writing of this article.
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Further Reading
Keywords
lymphomas, endocrine tumors, mesenchymal tumors, Hodgkin disease of the mediastinum, Hodgkin's disease of the mediastinum, nodular sclerosing lymphoma of the mediastinum, substernal goiter, mediastinal parathyroid adenoma, mediastinal parathyroid carcinoma, mediastinal thyroid adenoma, mediastinal thyroid carcinoma, lipoma, liposarcoma, hemangioma, angioma, angiosarcoma, rhabdomyoma, rhabdomyosarcoma, fibroma, fibrosarcoma, malignant fibrous histiocytoma, lymphangiomas, lymphangiosarcomas, leiomyoma, leiomyosarcoma, mediastinal Hodgkin lymphoma, mediastinal Hodgkin's lymphoma, mediastinal neoplasm, mediastinal lymphoma, neurogenic tumor, thymic tumors, germ cell tumor, foregut cyst, pericardial cyst, lymphangiomas, tumors of the thymus, thymic tumors, mesenchymal tumors, parathyroid tumors, mesenchymal mass, parathyroid mass
Follow-up: Lymphomas, Endocrine, Mesenchymal, and Other Rare Tumors of the Mediastinum