Kaposi sarcoma (KS) is a cancerous tumor of the connective tissue.
KS is the result of infection with a herpesvirus known as Kaposi sarcoma-associated herpesvirus (KSHV), or human herpesvirus 8 (HHV8). It is in the same family as the Epstein-Barr virus, which causes mononucleosis.
KSHV is transmitted mainly through saliva. It can also be spread through sexual contact, blood transfusion, or transplants. After it enters the body, the virus can infect different kinds of cells, especially cells that line blood vessels and lymphatic vessels. Like all herpesviruses, KSHV remains in your body for the rest of your life. If your immune system becomes weakened in the future, this virus may have the chance to reactivate, causing symptoms.
There are four types of KS based on the groups of people who are infected:
The tumors (lesions) most often appear as bluish-red or purple bumps on the skin. They are reddish-purple because they are rich in blood vessels.
The lesions may first appear on any part of the body. They also can appear inside the body. Lesions inside the body may bleed. Lesions in the lungs can cause bloody sputum or shortness of breath.
The health care provider will perform a physical exam, focusing on the lesions.
The following tests may be performed to diagnose KS:
How KS is treated depends on:
Lesions may return after treatment.
Treating KS does not improve the chances of survival from HIV/AIDS itself. The outlook depends on the person's immune status and how much of the HIV virus is in their blood (viral load). If the HIV is controlled with medicine the lesions will often shrink away on their own.
Complications can include:
The tumors can return even after treatment. KS can be deadly for a person with AIDS.
An aggressive form of endemic KS can spread quickly to the bones. Another form found in African children does not affect the skin. Instead, it spreads through the lymph nodes and vital organs, and can quickly become deadly.
Safer sexual practices can prevent HIV infection. This prevents HIV/AIDS and its complications, including KS.
KS almost never occurs in people with HIV/AIDS whose disease is well controlled.
Reviewed By: Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School; Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.