[Solitary fibrous tumor. Clinic and pathological study of 16 cases].

BACKGROUND: Solitary fibrous tumor (SFT) is a localized fibrous mesothelioma and was originally described as a benign pleural lesion. It is a mesenchymatous lesion that has been found in different structures and tissues of the human organism. It originates from a stromal fibroblastic cell positive to CD4. We undertook this study to determine the clinical and histopathological characteristics of SFT found from January 1, 2002--January 31, 2010 in a concentrated third-level general hospital in Mexico City. METHODS: We present 16 resected cases of different localizations: three pleural, three mediastinal, three lung, two oral cavity, one nasopharyngeal, one in the lateral aspect of the neck, one kidney, one paratesticular and another in the crural region. All were studied with hematoxylin and immunoperoxidase. RESULTS: There was similar affection in both genders. Mean age was 51 years (range: 43-81 years). Two pleural cases presented recurrence and one had hypoglycemia but none demonstrated metastases. No deaths were registered during a mean follow-up of 18 months. Histological pattern corresponded to a fusocellular growth that coincided with hemangiopericytoid zones in five cases and sarcomatoid in four. These cases were considered as mixed. All were positive to vimentin. CONCLUSIONS: Definitive diagnosis must be made by immunoperoxidase. Immediate treatment is surgical resection; relapses.

Giant solitary fibrous tumor of the pleura.

BACKGROUND: Solitary fibrous tumor is the second primary malignancy of the pleura and can reach up to 39 cm in diameter; however, to be referred to as 'giant' it must occupy at least 40% of the affected hemithorax. Although this tumor usually shows a benign behavior, malignancy criteria have been described. The aim of the study was to assess the initial evaluation, diagnostic procedures, surgical management, treatment outcome, and prognosis. METHODS: We performed a descriptive, observational, longitudinal, and retrospective study from 2002 to 2006 on patients who underwent surgery with a diagnosis of giant solitary fibrous tumor of the pleura. RESULTS: Six patients were included; 83.3% were females. Mean age was 48 years. All patients were symptomatic, mainly dyspnea, cough and chest pain; 66.7% were left-sided. Preoperative angiography and embolization were performed in 83.3% cases with successful surgical resection. The predominant blood supply was derived from the internal mammalian artery. Intraoperative complication rate was 17%. A vascular pedicle was found in 66.7%. The largest lesion was 40 cm in diameter and weighed 4500 g. Only one case showed high mitotic activity. Mean follow-up to date is 14 months. CONCLUSIONS: Symptomatology found was consistent with previous reports but in higher percentages. Accurate diagnosis is critical because surgical resection involves a potential cure; however, long-term follow-up is mandatory. Preoperative embolization is recommended due to tumor size.