Mesenchymal stem cells (MSCs) transplantation has been used for therapeutic applications in various diseases. Here we report MSCs can malignantly transform in vivo. The novel neoplasm was found on the tail of female rat after injection with male rat bone marrow-derived MSCs (rBM-MSCs) and the new tumor cell line, K3, was isolated from the neoplasm. The K3 cells expressed surface antigens and pl...

Ameloblastic fibroma is a rare benign tumor usually affects the first two decades of life. The neoplasm more predominant in mandibular molar-premolar region and rarely maxilla. In this report, we present couple cases, affecting boys at their 1st decade. lesions were presented as swellings maxilla, which atypical location. Radiographic images showed well-defined radiolucency containing areas rad...

Solitary fibrous tumor (SFT) was first described in the pleura by Lietaud in 1767; later in 1870, Wagner described the localized nature of this type of tumor and Klemperer and Rabin classified pleural tumors into two types: diffuse mesotheliomas and localized mesotheliomas. Recent years have seen the redefinition of this neoplasm, due to better technology; it is now proven that this neoplasm ma...

Synovial sarcoma is defined as a mesenchymal spindle cell tumour which displays variable epithelial differentiation including glandular formation and has a specific chromosomal translocation [1]. It is an aggressive and rare neoplasm which is histologically classified into two subtypes: monophasic and biphasic. Epithelial predominant synovial sarcoma can mimic epithelial neoplasms and is freque...

Solitary fibrous tumors are neoplasms of mesenchymal origin that may occur virtually in any body part, most commonly arising from the pleura. Solitary fibrous tumor of the kidney is exceptionally rare, and limited clinical knowledge regarding its behavior makes prognosis of the neoplasm difficult. We report a case of solitary fibrous tumor of the left kidney and describe its clinical, imaging, ...

Solitary fibrous tumor (SFT) is a spindle cell neoplasm of mesenchymal origin that typically arises from the pleura. Several extrapleural sites have also been described, including the orbit, lacrimal gland fossa, and lacrimal sac. We present the clinical, imaging, and histopathologic findings of an SFT arising from the sclera that manifested as an intraocular mass with extrascleral extension.

Solitary fibrous tumor is an uncommon spindle cell neoplasm that is believed to be of mesenchymal origin. Rarely does it originate in the oral cavity, and only 1 case of this lesion in the floor of the mouth has been previously reported. We describe a new case of solitary fibrous tumor arising from the soft tissues of the floor of the mouth.

Solitary fibrous tumor is a rare mesenchymal neoplasm that usually originates from the pleura, but has been reported in other extrapleural locations. We report a rare case of a solitary fibrous tumor of the stomach, which was successfully treated with endoscopic mucosal resection.

Received October 2009 Accepted November 2009 INTRODUCTION A gastrointestinal stromal tumor (GIST) is primarily located in the gastrointestinal tract. It is classified as a mesenchymal tumor that shows a CD117 (c-KIT)-positive mesenchymal spindle or epithelioid neoplasm. Tumors outside the gastrointestinal tract that were histologically similar to GISTs and showed immunopositivity for CD117 were...

Adenofibroma is an extremely rare benign biphasic neoplasm that is classified into the mixed epithelial and mesenchymal tumor group. These tumors tend to occur in postmenopausal and elderly women. We report the case of a large polypoidal mass per vagina occupying the whole pelvis in a young woman. Preoperative biopsy showed benign epithelial and mullerian mesenchymal components suggestive of mu...