Product Highlights. The A290 Series fixed bar return air filter grille with fixed horizontal blades accepts a 1 air filter (not included) and features 3/4 fin spacing.
A sarcoma (from the Greek ÏÎ¬ÏÎ¾ 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.his 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.
1 Lymphangiomas, benign tumors of lymph vessels. 2  Myxoma is a benign tumor that usually is located in muscles but does not start from muscle cells. 3  Neurofibromas, tumors of nerve tissue that are usually benign. 4  Neurofibromas of large nerves, such as those in the upper arms or neck can become cancerous. Hibernomas, benign tumors of fat tissue. 2  Lipomas, very common benign tumors of fat tissue. 3  Leiomyomas, benign tumors of smooth muscle that can be found anywhere in the body but are very common in the walls of the uterus where they are known as fibroids.