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Mesothelioma stages - ReadNews

IMIG stages

The staging system most commonly used in the UK for pleural mesothelioma is called the International Mesothelioma Interest Group (IMIG) system. 

It is based on the TNM (tumour, node, metastasis) system, which is used for many different cancers. This describes:

• the size and position of the primary mesothelioma tumour (T)
• whether mesothelioma cells have spread to nearby lymph nodes (N)
• whether mesothelioma cells have spread to
  
  other parts of the body - metastases (M)

Once the TNM categories have been decided, this information is grouped together to give the stage. Stage 1 is the earliest stage and stage 4 is the most advanced stage.

Stage 1

Mesothelioma cells are in the pleura around the lung on one side of your chest.

Stage 1a 

Mesothelioma cells are in the outer layer of the pleura (parietal pleura) on one side of the chest.

Stage 1b

Mesothelioma cells are in the inner layer of the pleura (visceral pleura), but only on one side of the chest. They have not spread to your lung tissue or diaphragm.

Stage 2

Mesothelioma has spread to both layers of the pleura on one side of the body, and has enlarged to form a tumour mass on the pleural tissue around the lungs, or has started to spread into the diaphragm muscle or the lung tissue.

Stage 3

Mesothelioma has spread to the chest wall or the covering of the heart (pericardium), but is still potentially removable by surgery. Or it has spread to the lymph nodes on the same side of the chest.

Stage 4

Mesothelioma cannot be removed by surgery because it has spread to different parts of the chest wall, or has grown through the diaphragm into the peritoneum, or to the pleura on the other side of the body, or to the chest organs, or through to the inner layer of the pericardium. 

Or it has spread to the lymph nodes on the other side of the chest, or above the collarbone. Or has spread to other parts of the body.

http://www.cancerresearchuk.org/about-cancer/mesothelioma/stages

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