MCL injury is also part of the  Unhappy Triad , or the common injury of the MCL, ACL, and Meniscus all together, usually through a pivot shift type of mechanism.The most obvious sypmtom of MCL injury is pain. Following the injury, you will experience pain in the knee, usually along the iside of the joint.CL injury is also part of the  Unhappy Triad , or the common injury of the MCL, ACL, and Meniscus all together, usually through a pivot shift type of mechanism.
With hemangiosarcoma, the pericardium fills up with blood due to rupture of the tumor. When the tumor occurs in the skin, a mass or lump can usually be felt in or under the skin. The mass may become ulcerated and bleed. When the tumor occurs in a bone, it can cause pain and discomfort.
In the case of blood cancers, where there is often not a solid mass of tumor, pain can occur for a few reasons. For example, leukemia cells can cause discomfort when they accumulate in such organs as the liver or spleen. Leukemia patients often complain of pain in their bones and joints, which is usually caused by the overactive marrow putting pressure on the bones from the inside out.