Solitary fibrous tumor of renal pelvis

A 70-year-old Japanese man was referred because of a right renal mass of 2 years in duration. Imaging studies, including magnetic resonance imaging, revealed an ovoid mass, with relatively abundant vascularity, in the right renal pelvis. Right radical nephrectomy was done and a tumor measuring 6.0 x 4.5 x 4.0 cm was found in the renal pelvis. Solitary fibrous tumor (SFT) was highly suspected by histology. Immunohistochemical study using a monoclonal antibody directed against the human hematopoietic progenitor cell antigen (CD34) stain confirmed SFT. This is the first case of SFT of the renal pelvis. Although SFT is extremely rare in urogenital organs, this tumor must be included in the differential diagnosis when we encounter urogenital tumors consisting of mesenchymal elements.     

Solitary fibrous tumor of the fourth ventricle: case report

A rare case of solitary fibrous tumor, located wholly within the fourth ventricle, is reported. A 57-year-old male presented with headache and nausea. The preoperative magnetic resonance images revealed a well circumscribed mass in the fourth ventricle that exhibited a low intensity on T1-weighted images and homogeneously enhanced with gadolinium. Vertebral angiogram revealed a tumor stain supplied from the choroidal branches of the posterior inferior cerebellar artery. The tumor was totally resected through a midline suboccipital approach. Histologically, the tumor was composed of spindle-shaped cells growing in fascicles within a collagenous matrix. Immunohistochemical staining demonstrated vimentin and the CD34 positivity of tumor cells. Solitary fibrous tumor is a newly described entity, which should be considered in the differential diagnosis for dural-based lesions.     

Solitary fibrous tumor of the scalp: a case report

The solitary fibrous tumor is a rare tumor, ubiquitous, mesenchymatous essentially affecting serosal surfaces. The location in the scalp is exceptional. We report a case of tumor in left occipital scalp discovered after recurrence of a tumor initially taken for a lipoma. The motive for consultation was mainly aesthetic. The pathological examination is the main element of diagnosis. The assumption is based on a large lumpectomy and an extended and regular clinical monitoring. The forecast is favourable with a decline of one year. However, relapses may occur in the long-term and there are malignant forms.     

Solitary fibrous tumor of the urinary bladder: a case report

A 41-year-old woman with an incidental tumor of the urinary bladder was referred to our hospital. Computed tomography and magnetic resonance imaging showed a tumor in the urinary bladder wall with expansive growth. Under the suspicion of leiomyoma, we performed transurethral resection of the tumor. Pathological examination of tumor specimens revealed patternless arrangements of spindle cells. Immunochemical analysis revealed tumor cells positive for CD34 and bcl-2. The final diagnosis was a solitary fibrous tumor.     

Solitary fibrous tumor of a kidney: a case report

We report a case of solitary fibrous tumor (SFT) arising from a kidney. The patient was an 18-year-old female who visited our hospital with the complaint of left abdominal pain. Computed tomography revealed a slightly enhanced tumor of approximately 3 cm in diameter near the upper calyx of the left kidney. Renal cell carcinoma was suspected, and left nephrectomy was performed under laparoscopy. Histopathological examination revealed proliferation of CD34-positive spindle-shaped cells, and a diagnosis of SFT was made. There has been no local recurrence or distant metastasis for 15 months after the operation.     

Solitary fibrous tumor of a kidney: a case report

The patient was a 44-year-old woman who had undergone a medical examination because of a left kidney mass. A radical nephrectomy was performed under diagnosis of renal cell carcinoma. Microscopically tumor consisted of spindle-shaped cells accompanied by fibrous connective tissue. Immunohistochemically the tumor cells were diffusely positive for CD34, negative for HMB45 antigen and tyrosinase. The final diagnosis was solitary fibrous tumor.     

Solitary fibrous tumor in the pelvic space: a case report

A 49-year-old man presented to our hospital complaining of difficulty in urination. Magnetic resonance imaging revealed a 10 cm mass posterolateral to the bladder. It was separated from the bladder, seminal vesicle and rectum, but indistinct from the prostate. Preoperative pathological diagnosis was established by transrectal needle biopsy as solitary fibrous tumor. The tumor and the prostate were resected en bloc by retropubic radical prostatectomy, while the bladder and rectum were preserved. The surgical margin was negative and no relapse was noted six months postoperatively.     

Solitary fibrous tumor of the orbit with extraorbital extension: case report

OBJECTIVE AND IMPORTANCE: Solitary fibrous tumors (SFTs) are rare tumors of mesenchymal origin that typically arise in the pleura. Only 24 cases of SFTs in the orbit have been reported, all located within the orbit and generally with a benign course. We report the first case of an orbital SFT with extraorbital extension and short-term regrowth. CLINICAL PRESENTATION: A 54-year-old man presented with proptosis and double vision that had persisted for 7 months. The tumor extended from the right extraconal inferolateral orbit to the extradural middle cranial fossa and cavernous sinus, via the superior orbital fissure, on magnetic resonance imaging scans. Positron emission tomography with [(18)F]fluorodeoxyglucose demonstrated faint uptake in the orbital portion. INTERVENTION: Resection of the tumor was performed twice, because of short-term regrowth of the residual tumor in the orbit. The histological diagnosis was a SFT. The MIB-1 labeling index was 7% and the mitotic count was 5 mitotic figures/10 high-power fields at the time of the second operation. These findings indicate the malignant nature of the tumor. CONCLUSION: The natural history of SFTs of the orbit remains unclear, and the importance of careful and continued follow-up monitoring of the tumor should be emphasized.     

Solitary hydatid cyst in the pelvis: A case report

Hydatid disease mainly affects the liver and the lungs. Pelvic involvement have been rarely reported in the literature. Herein we present a rare case of isolated hydatid cyst of pelvis attached to the urinary bladder.     

Solitary fibrous tumor of the pleura; report of a case

An 81-year-old male appealed against a feeling of dyspnea, and consulted the hospital. The giant tumor discovered in the thorax and it was enlarging gradually for 7 years. The tumor shadow with a diameter of about 15 cm was noted in right lower lung field on the chest X-ray. A definite diagnosis was not obtained by the needle biopsy. The tumor was found to exist between upper lobe and lower lobe and pressed lower lobe at surgery. The tumor was completely excised with partial resection of the collapsed lower lobe. The tumor was 1,050 g in weight and 18 cm in maximum diameter. Pathological examination showed the irregular and plan-like arrangement of the spindle-shape cell. Immunohistochemical study revealed positive findings for bcl-2 and CD34, negative findings for desmin, ketatin, and alpha-actin. The tumor was diagnosed as malignant solitary fibrous tumor of the pleura due to highly atypical nuclear finding with an abundant nuclear fission or histology.     

Solitary fibrous tumor of the breast: A case report and the review of the literature

Solitary fibrous tumors (SFT) are rare mesenchymal neoplasms. They were first described as spindle‐cell tumors originating from the pleura, but they may arise in any anatomical site. SFT of the breast is an exceedingly rare clinical entity. Our literature review yielded only 21 cases reported so far. We describe a case of a SFT of the breast in a premenopausal patient who presented with a gradually enlarging palpable breast mass. Diagnostic evaluation and management are discussed along with a review of the relevant literature. There are no pathognomonic imaging findings of SFT of the breast. Complete surgical resection with clear margins is the gold standard of treatment. Thorough immunohistochemical analysis is crucial to obtain a definitive diagnosis. Although most SFTs run an indolent course, in some cases the clinical behavior can be unpredictable and a long‐term follow‐up for all patients is therefore mandatory.     

肝脏孤立性纤维性肿瘤1例

正患者男,41岁,反复上腹胀2个月。CT(图1):平扫显示肝右叶前下段类圆形肿块影,边界清楚,大小约7.54cm×6.91cm,呈不均匀性稍低密度,CT值30 HU,增强扫描动脉期病灶内可见少许明显强化血管影,肿块整体呈不均匀性轻度强化,CT值45HU,静脉期(CT值51HU)及延迟期(CT值68HU)进一步强化,整体呈不均匀性渐进性强化。MRI(图2):肿块T1WI呈稍低信号,其内可见斑片状更低信号,T2WI呈混杂高信号,可见斑片状或条索状低信号,T2WI压脂     

气管孤立性纤维性肿瘤1例

正患者女,47岁,因"受凉后咳嗽、咳痰2周,咯鲜红色血痰1天"入院。气管镜检查:气管管腔内距气管隆突约2~3cm处见一新生物,约1.2cm×0.8cm,气管管腔近1/2被堵塞,表面有较多血性分泌物(图1A)。胸部CT:平扫见气管隆突前上方的气管左侧壁有一乳头状结节影,密度均匀,CT值61 HU,边缘光整,与相邻的气管壁呈窄基相连,气管壁未见异常;增强后肿块明显均匀强化(图1B),CT值201 HU,相邻的气管壁无明     

Solitary fibrous tumor of the mediastinum. A report of 14 cases

Fourteen cases of a mediastinal neoplasm identical to solitary fibrous tumor (so-called fibrous mesothelioma) of the pleura were observed. The lesions presented with cough, chest pain, dyspnea, or as asymptomatic masses detected radiographically. Two patients had associated hypoglycemia. Eleven of the tumors were in the antero-superior mediastinum. One arose on a pedicle from the thymus, and another had entrapped thymic elements. Tumor cells were variably immunoreactive for vimentin and actin, but not for keratin, and lacked ultrastructural evidence of mesothelial or epithelial differentiation. Eight cases had highly cellular mitotically active regions of which six of seven with follow-up behaved aggressively; the exception was the pedunculated tumor. A 13-cm, histologically bland tumor has recurred twice. Aggressive behavior was more common than reported for solitary fibrous tumor of the pleura, but the same criteria (size, cellularity, mitotic activity, presence of pedicle) were of prognostic significance. The occurrence of solitary fibrous tumor in the mediastinum with the suggestion of thymic origin for some cases, combined with the immunohistochemical and ultrastructural findings, support a mesenchymal origin for this tumor. The differential diagnosis includes spindle cell thymoma, hemangiopericytoma, and peripheral nerve tumors.