Aberrant thymoma in the anterior mediastinum. A case report.
Keywords:
THYMOMA, MEDIASTINAL NEOPLASMS.Abstract
The thymic gland may be the place for a variety of malign and benign neoplasias. Although these tumors are relatively weird in the population, they are interest in the medical literature for their clinical- pathological manifestations. It is reported a case of a 45 year-old woman who presented minor right thoracic pain and dispnea with a mediastinal right anterior enlargement perceived in a thoracic radiography (lateral post- anterior view). The computerized tomography showed a hyperdense area, with homogeneous contrast . The transternal mediastinotomy was performed and a soft, yellowish tumor wa spotted. It was histologically diagnosed as a lymphocytic thymoma. The thymoma is a benign epithelial tumor of low grade, generally located in the upper anterior mediastinum. Nevertheless, when there is an ectopic or an aberrant gland, there may be found thymomas in some other mediastinal regions, such as the neck, hilus pulmonary, thyroid glands, lung or pleura.
The thymomas are the second most frequent neoplasias in the mediastinum with a 20% and the first neoplasias in the upper anterior mediastinum. They are not commonly presented in childhood and the major incidence lies in the third and fifth decades. They are usually symptomathic and the symptoms may be lymphocitic, epithelial (or both) . The mixt term lymphocitic and epithelial is used as a synonym of lymphoepithelioma. In literature there are numerous reports about the adequate treatment of thymoma , including surgery, radiotherapy, chemotherapy or the combination of both. Thymomas are surgically treated obtaining great results .
The diagnosed researches with image techniques are important and essential when determining the presence of tumors and their extension to adjacent structures. Systematic thorax radiographies consiting on a post anterior and lateral view and the TAC may show the thymomas. These tumors appear frequently as lobe masses, smooth in the upper side of the anterior mediastinum and they are generally projected in one hemithorax. The mass may be calcified, containing grease or be cystic and it is less frequent in the anterior – inferior mediastinum, like in this case.
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