Sarcoma
Lymphomas, endocrine, mesenchymal, and other rare tumors of the mediastinum. Lateral chest radiograph of a 30-year-old man found to have Hodgkin disease of the mediastinum (same patient as in previous image). Of all parathyroid tumors, only 1-3% are truly mediastinal in location, defined as those inaccessible by standard cervical exploration and requiring median sternotomy for excision. Mesenchymal tumors represent approximately 6% of all masses found in Benign, macroscopic fat-containing liver lesions of mesenchymal origin include hepatic angiomyolipomas and hepatic lipomas. 25 Hepatic angiomyolipoma (AML) is a benign mesenchymal tumor composed of mature adipose tissue, thick-walled vessels, and smooth muscle. Hemangioma. Hepatic hemangiomas are the most common solid, benign liver tumor; they consist of blood-filled spaces lined by endothelium, along with a variable presence of thrombi, calcification, fibrosis, and scarring. Intramural gastric tumors are typically mesenchymal in origin and include gastrointestinal stromal tumors (GISTs), non-GIST sarcomas, lipomas, leiomyomas, schwannomas, glomus tumors, hemangiomas, inflammatory fibroid polyps (IFPs), inflammatory myofibroblastic tumors (IMFTs), and plexiform fibromyxomas. In contrast to most epithelial neoplasms, mesenchymal tumors are often well-circumscribed, with intact overlying mucosa. These tumors can grow in an endoluminal, exophytic, or mixed (dumbbell-shaped) pattern (Fig 2). Smaller masses and lesions arising in the submucosa often protrude into the lumen of the stomach. A sarcoma (from the Greek σάρξ sarx meaning flesh) is a cancer that arises from transformed cells of mesenchymal origin. Thus, malignant tumors made of cancellous bone, cartilage, fat, muscle, vascular, or hematopoietic tissues are, by definition, considered sarcomas. This is in contrast to a malignant tumor originating from epithelial cells, which are termed carcinoma. Human sarcomas are quite rare. Common malignancies, such as breast, colon, and lung cancer, are almost always carcinoma. Lymphomas, endocrine, mesenchymal, and other rare tumors of the mediastinum. Posteroanterior chest radiograph of a 30-year-old man found to have Hodgkin disease of the mediastinum. Arrows indicate areas of prominent lymphadenopathy associated with his disease. Of all parathyroid tumors, only 1-3% are truly mediastinal in location, defined as those inaccessible by standard cervical exploration and requiring median sternotomy for excision. Mesenchymal tumors represent approximately 6% of all masses found in OBJECTIVES: To describe 2 cases of mesenchymal pediatric penile tumors in a 13-year-old boy and an 11-month-old infant. Mesenchymal tumors are rare in the male external genitalia. METHODS: Two patients, one aged 13 years and one 11 months, presented with painless penile masses at the penoscrotal junction. The evaluation included serial clinical examinations and ultrasonography. GENERAL INFORMATION. Benign Fibrous Histiocytoma is a rare tumor of mesenchymal origin. First described in 1958 by Dahlin. They are composed of two cell types, namely atypical fibroblasts and histiocytes, arranged in a storiform pattern. Lipid-filled cells may be conspicuous and occasionally are the major component. These types of benign fibrous histiocytomas are known as xanthomas or fibroxanthomas. A benign tumor is a mass of cells (tumor) that lacks the ability to invade neighboring tissue or metastasize. These characteristics are required for a tumor to be defined as cancerous and therefore benign tumors are non-cancerous. One of the most important factors in classifying a tumor as benign or malignant is its invasive potential. If a tumor lacks the ability to invade adjacent tissues or spread to distant sites by metastasizing then it is benign, whereas invasive or metastatic tumours are malignant. The mass effect of tumors are more prominent if the tumor is within an enclosed space such as the cranium, respiratory tract, sinus or inside bones. Tumors of endocrine tissues may overproduce certain hormones, especially when the cells are well differentiated. One of the most important factors in classifying a tumor as benign or malignant is its invasive potential. If a tumor lacks the ability to invade adjacent tissues or spread to distant sites by metastasizing then it is benign, whereas invasive or metastatic tumours are malignant. Also, benign tumors generally have a slower growth rate than malignant tumors and the tumor cells are usually more differentiated (cells have normal features). Benign tumors are typically surrounded by an outer surface (fibrous sheath of connective tissue) or remain with the epithelium. One of the most important factors in classifying a tumor as benign or malignant is its invasive potential. If a tumor lacks the ability to invade adjacent tissues or spread to distant sites by metastasizing then it is benign, whereas invasive or metastatic tumours are malignant.
http://emedicine.medscape.com/article/427817-overview http://appliedradiology.com/articles/confidently-characterizing-benign-liver-tumors http://pubs.rsna.org/doi/full/10.1148/rg.336135507 https://en.wikipedia.org/wiki/Sarcoma http://emedicine.medscape.com/article/427817-overview http://www.ncbi.nlm.nih.gov/pubmed/17169655 http://www.tumorsurgery.org/tumor-education/bone-tumors/types-of-bone-tumors/benign-fibrous-histiocytoma.aspx https://en.wikipedia.org/wiki/Indolent_lesions_of_epithelial_origin https://en.wikipedia.org/wiki/Indolent_lesions_of_epithelial_origin https://en.wikipedia.org/wiki/Indolent_lesions_of_epithelial_origin
benign tumor of mesenchymal origin