Mesothelioma Stages:Butchart Staging System

The staging system historically used for mesothelioma is the Butchart system. This system is based on the extent of the primary tumor mass, and, like the other systems, divides mesothelioma into stages I through IV. Many doctors will still use this system, even though TNM has surpassed it in for accuracy.

Stage I

Mesothelioma is present within the right or left pleura, and may also involve the lung, pericardium, or diaphragm (the muscle separating the chest from the abdomen) on the same side.

Stage II

Mesothelioma invades the chest wall or involves the esophagus (food passage connecting the throat to the stomach), heart, or pleura on both sides. The lymph nodes in the chest may also be involved.

Stage III

Mesothelioma has penetrated through the diaphragm into the peritoneum (lining of the abdominal cavity). Lymph nodes beyond those in the chest may also be involved.

Stage IV

There is evidence of distant metastases spread through the bloodstream to other organs.