Biopsy

A biopsy is needed to confirm a mesothelioma diagnosis. In a biopsy, a surgeon or a medical oncologist (a doctor who specializes in diagnosing and treating cancer) removes a sample of tissue for examination under a microscope by a pathologist. A biopsy may be performed in different ways, depending on where the abnormal area is located.

Thoracoscopy
If the cancer is in the chest, the doctor may perform a thoracoscopy. In this procedure, the doctor makes a small cut through the chest wall and puts a thin, lighted tube called a thoracoscope into the chest between two ribs. Thoracoscopy allows the doctor to look inside the chest and obtain tissue samples.

Peritoneoscopy
If the cancer is in the abdomen, the doctor may perform a peritoneoscopy. To obtain tissue for examination, the doctor makes a small opening in the abdomen and inserts a special instrument called a peritoneoscope into the abdominal cavity.

Surgery
If these procedures do not yield enough tissue to make a diagnosis, more extensive diagnostic surgery may be necessary.