How Mesothelioma Spreads

In the chest, the tumor typically spreads across the pleura, covering the lung and the inner chest wall like a thickening sheet. It can move into the grooves between lung lobes and along the diaphragm. In the abdomen, peritoneal disease spreads across the surfaces of organs and the abdominal wall. This surface pattern often causes fluid to build up and can gradually restrict breathing or digestion. It also makes the disease harder to measure than tumors that grow as a round mass.

Over time, the tumor may push into deeper structures: lung tissue, chest wall muscle and ribs, the diaphragm, or organs in the center of the chest. Invasion of the chest wall often causes localized pain. Some people develop tumor growth along the tracks left by earlier procedures such as biopsies or drains. Doctors may use MRI or careful CT review to assess how deep the tumor has gone, because that affects surgical options and staging. Some centers use radiation or careful planning to reduce the chance of tumor growing along procedure tracks. Ask whether this is recommended in your case, particularly if you have had several drains or biopsies.

Spread to lymph nodes usually happens after local growth, and distant spread, such as to the other lung, the abdomen from the chest, or other organs, tends to occur later in the course. Autopsy studies have shown that distant spread can be more common than scans suggest, which is one reason systemic treatments are part of many plans. Regular follow-up scans help catch changes, and new symptoms in distant areas should always be reported. Symptoms of distant spread depend on where it occurs. Abdominal swelling, new bone pain, or breathlessness on the opposite side are examples worth reporting promptly.

1. 1

   Report new pain in the chest wall, ribs or back to your team promptly.

2. 2

   Watch for lumps near biopsy, drain or surgery scars and mention them at visits.

3. 3

   Ask whether MRI is recommended to assess chest wall or diaphragm involvement.

4. 4

   Keep a list of new symptoms in areas away from the original tumor site.