]> 2026-07-31T07:49:41+00:00 WBR0803 0 en Osteosarcoma Osteosarcoma is the most common type of malignant bone cancer, accounting for 35% of primary bone malignancies. There is a preference for the metaphyseal region of tubular long bones. 50% of cases occur around the knee. It is a malignant connective (soft) tissue tumor whose neoplastic cells present osteoblastic differentiation and form tumoral bone. Rhabdomyosarcoma A rhabdomyosarcoma is a type of cancer, specifically a sarcoma (cancer of connective tissues), in which the cancer cells are thought to arise from skeletal muscle progenitors. It can also be found attached to muscle tissue, wrapped around intestines, or anywhere, to include the neck area. It is most common in children ages one to five, and teens aged 15 to 19, although quite rare in the latter. It can be a cardiac manifestation of tuberous sclerosis. Angiosarcoma Hemangiosarcoma is a rare, rapidly growing, highly invasive variety of cancer. It is a blood-fed sarcoma; that is, blood vessels grow directly into the tumor and it is typically filled with blood. A frequent cause of death is the rupturing of this tumor, causing the victim to rapidly bleed to death. Melanoma See overall explanation Lymphoma Lymphoma is a type of cancer that originates in lymphocytes (a type of white blood cell in the vertebrate immune system). There are many types of lymphoma. It can metastasize to the liver, but night sweats, weight loss and fever symptoms are not mentioned in the history. Internal medicine A 55-year-old man with darker skin is admitted to the hospital due to abdominal pain. The ER doctor orders lab tests and a CT scan, which shows multiple liver metastasis. On physical examination he does not have a toe; he says it was removed at the age of 20 for a tumor on the nail bed. The patient is admitted to the hospital. The internal medicine and oncology team tries to identify the primary tumor ordering a CXR and other diagnostic studies without any success. Which of the following is the most likely primary tumor? D Dermatology Oncology 2020-10-28T01:45:18Z 2459150.573125 WBR0803