Receiving a mesothelioma diagnosis can be overwhelming for you and your family, especially when trying to understand the specific type you or a loved one is facing. The two most common forms of this rare cancer are pleural mesothelioma, which develops in the lining of the lungs, and peritoneal mesothelioma, which develops in the lining of the abdominal cavity. Both types stem from asbestos exposure, but they differ in where they develop, how they progress, the symptoms they cause, and the treatment approaches doctors typically recommend. Understanding these differences can help you and your medical team make informed decisions, and it can also help you understand your legal options if asbestos exposure is the cause.
At The Williams Law Firm, P.C., we have never lost a mesothelioma case. Our team, led by founding partner Joseph P. Williams, has more than 30 years of experience helping victims of asbestos exposure understand their diagnosis while pursuing the compensation they may be entitled to. Our New York asbestos attorneys take the time to explain how the type of mesothelioma you have been diagnosed with can affect both your medical journey and your legal strategy. With offices in both New York and Texas, we represent mesothelioma victims nationwide, regardless of which type of mesothelioma you or your loved one has been diagnosed with.
Before looking at each type in detail, it can help to see how pleural and peritoneal mesothelioma compare side by side. The following distinctions affect diagnosis, treatment planning, and, in many cases, the legal strategy your attorney may recommend.
These differences matter because they shape how doctors approach a diagnosis and how an asbestos injury attorney may evaluate a potential claim on your behalf. They can also help set realistic expectations for you and your caregivers, since the treatment schedule, recovery process, and day-to-day symptoms for pleural mesothelioma often look quite different from those associated with peritoneal mesothelioma, even though both conditions share the same underlying cause.
The primary difference between pleural and peritoneal mesothelioma is where the cancer develops in the body, which in turn affects how the disease progresses and how it presents.
Pleural mesothelioma develops in the pleura, the thin membrane made up of an outer parietal layer that lines the chest wall and an inner visceral layer that covers the lungs themselves. When asbestos fibers are inhaled, they can become lodged in this delicate tissue, causing chronic inflammation and cellular damage over time. As the cancer develops, these layers can thicken and form nodules, and fluid often accumulates between them, which contributes to the breathing difficulties associated with pleural mesothelioma.
Peritoneal mesothelioma affects the peritoneum, the protective lining that covers the abdominal cavity and surrounds organs such as the stomach, liver, and intestines. Asbestos fibers can reach the peritoneum in more than one way. In some cases, a person swallows contaminated mucus after inhaling asbestos, and in others, inhaled fibers migrate from the lungs through the lymphatic system. Like the pleura, the peritoneum has a parietal layer that lines the abdominal cavity and a visceral layer that covers the abdominal organs. As cancer develops in the peritoneum, it can cause fluid buildup in the abdomen and the formation of tumors on both layers of the membrane.
The location of the cancer strongly influences the symptoms a person experiences, which can help doctors differentiate between the two types during diagnosis. Symptoms of either type typically appear ten to fifty years after asbestos exposure, and because they often develop gradually, they can be mistaken for more common conditions.
Symptoms of pleural mesothelioma primarily affect the respiratory system and chest. Common signs include a persistent dry or painful cough, shortness of breath, chest pain or tightness, difficulty swallowing, hoarseness or voice changes, unexplained weight loss, and fatigue. These symptoms often develop gradually and may be mistaken for less serious conditions like pneumonia, bronchitis, or even the flu, which can delay a proper diagnosis. Our related guide on what pleural mesothelioma does to your lungs explains these respiratory changes in more depth.
The symptoms of peritoneal mesothelioma focus on the abdominal region and can include abdominal pain and swelling, nausea and vomiting, constipation or diarrhea, loss of appetite, unexplained weight loss, night sweats and fever, fatigue, and the development of a mass in the abdomen. These symptoms can be confused with other digestive disorders like irritable bowel syndrome, Crohn’s disease, or even food poisoning, which can also delay diagnosis. For a closer look at these signs, see our guide on the symptoms specific to abdominal mesothelioma.
Some symptoms, such as fatigue, unexplained weight loss, and night sweats, can show up in both pleural and peritoneal mesothelioma, since these are systemic responses to cancer rather than symptoms tied to one specific location. Keeping a simple record of when your symptoms first appeared and how they have changed over time can help your medical team track your condition, and it can also become useful documentation if you later pursue a legal claim related to your diagnosis.
Because early symptoms of both types can resemble more common illnesses, doctors typically rely on imaging tests, such as CT, MRI, or PET scans, along with blood tests, to help narrow down a diagnosis. A biopsy, in which a tissue or fluid sample is examined for cancer cells, remains the only definitive way to confirm mesothelioma and to identify which cell type is involved. For pleural mesothelioma, doctors may also use a procedure called thoracentesis to draw fluid from around the lungs, while peritoneal mesothelioma is often confirmed through a laparoscopic biopsy or a fluid sample taken from the abdomen.
Once mesothelioma is confirmed, doctors assign a stage that describes how far the cancer has spread. Pleural mesothelioma is generally staged using the tumor-node-metastasis (TNM) system, which considers the size and location of the tumor, whether nearby lymph nodes are involved, and whether the cancer has spread to other organs. Peritoneal mesothelioma does not have a formal staging system in the same way, so doctors and surgeons often rely on a peritoneal cancer index to describe how extensively the disease has spread throughout the abdominal cavity. You can learn more about how oncologists classify disease progression in our overview of the four stages of mesothelioma. Staging plays an important role in treatment planning, and it can also factor into the compensation an attorney pursues on your behalf, since more advanced disease is often tied to greater medical costs and lost income.
Because both pleural and peritoneal mesothelioma are rare and share symptoms with far more common illnesses, misdiagnosis is not unusual in the months leading up to a confirmed diagnosis. Patients are sometimes treated for pneumonia, irritable bowel syndrome, or another digestive condition before a mesothelioma specialist becomes involved. If you or a loved one has already received a diagnosis, seeking a second opinion from a doctor experienced in treating mesothelioma can help confirm the type, cell pattern, and stage of the disease before treatment begins.
Anyone who has been exposed to asbestos may be at risk of developing either type of mesothelioma, but the risk profile is not identical between the two. Pleural mesothelioma is closely tied to inhaled asbestos fibers and is strongly associated with occupational exposure among tradespeople who worked with insulation, piping, and other asbestos-containing materials. According to a gastrointestinal oncologist interviewed by MD Anderson Cancer Center, asbestos exposure is identified in roughly 80 to 90 percent of pleural mesothelioma cases, but in only about 30 to 40 percent of peritoneal mesothelioma cases, which means researchers do not yet fully understand what causes the disease in many peritoneal patients. That same source notes that peritoneal mesothelioma is also somewhat more common in women, which is the opposite pattern seen in pleural mesothelioma. Peritoneal mesothelioma is also considered the rarer of the two types overall, with an estimated 400 to 1,000 new cases diagnosed in the United States each year, according to the Cleveland Clinic, compared with a much larger number of pleural cases diagnosed annually.
Workers in construction, shipbuilding, power generation, and many skilled trades faced some of the highest exposure risks for decades before asbestos use was restricted, and family members who handled a worker’s contaminated clothing may also face elevated risk through secondhand exposure. Veterans who served in the Navy or other branches that relied on asbestos insulation aboard ships and in equipment also face a heightened risk of either type of mesothelioma, and many may qualify for VA benefits in addition to a civil claim against the manufacturers of asbestos products. Our overview of occupations with a higher risk of asbestos exposure covers many of the trades and workplaces most commonly connected to mesothelioma claims.
Treatment strategies vary significantly between pleural and peritoneal mesothelioma because of their different locations and behaviors in the body.
Treatment for pleural mesothelioma typically involves a multimodal approach that may include surgery, radiation therapy, chemotherapy, and immunotherapy, often used in combination depending on the stage and the patient’s overall health. Surgical options for pleural mesothelioma can include an extrapleural pneumonectomy, which removes the affected lung along with nearby tissue, or a less extensive lung-sparing procedure known as a pleurectomy with decortication. You can read more about this surgical option in our guide to mesothelioma pleurectomy and decortication surgery. Some clinical trials have also explored heated chemotherapy applied directly to the chest cavity during surgery, an approach similar to the one long used for peritoneal mesothelioma.
Peritoneal mesothelioma treatment has advanced considerably in recent years. Many patients are candidates for cytoreductive surgery combined with hyperthermic intraperitoneal chemotherapy, commonly known as CRS-HIPEC, in which surgeons remove visible tumors and then apply heated chemotherapy directly inside the abdominal cavity. Other patients may receive systemic chemotherapy or targeted therapies depending on their diagnosis. A 2022 study published in Anticancer Research found that patients treated with CRS-HIPEC for malignant peritoneal mesothelioma reached a median overall survival of 53 months, with roughly half of patients in the study surviving five years or more. Outcomes like these can vary widely from patient to patient, and your own care team is best positioned to explain what your specific diagnosis, stage, and overall health may mean for your treatment options and outlook.
Whether you have been diagnosed with pleural or peritoneal mesothelioma, the underlying cause is almost always the same: exposure to asbestos, often decades before symptoms appeared. That shared cause means both types of mesothelioma may support a legal claim against the companies responsible for manufacturing, distributing, or failing to warn about asbestos-containing products. The type of mesothelioma you have does not determine whether you may have a case, but it can affect the medical evidence, treatment costs, and life care planning your attorney uses to help build your claim.
Every state sets its own filing deadlines for asbestos-related claims, and these deadlines generally begin running from the date of diagnosis rather than the date of exposure, so acting promptly after a diagnosis is important. Families of mesothelioma victims may also be able to pursue compensation through active asbestos trust funds established by companies that once manufactured asbestos products, in addition to or instead of a traditional lawsuit. You can learn more about how these cases typically proceed in our overview of the mesothelioma lawsuit process. If a loved one has passed away from either type of mesothelioma, surviving family members may also be able to pursue a wrongful death claim in addition to, or in place of, a personal injury claim.
At The Williams Law Firm, P.C., we understand that each mesothelioma case is unique, and the type of mesothelioma you are facing affects both your medical journey and your legal options. For over 30 years, we have dedicated ourselves to representing victims of asbestos exposure, working to secure compensation that may help cover specialized treatment, regardless of whether you are living with pleural or peritoneal mesothelioma.
Our founding partner, Joseph P. Williams, will personally meet with you to discuss your specific situation, often in your own home if that is more comfortable during treatment. With our extensive experience in asbestos litigation and a deep understanding of the medical aspects of different mesothelioma types, we approach every case with the personalized attention it deserves. We have never lost a mesothelioma case, and we work on a contingency fee basis, which means you owe us nothing unless we recover compensation on your behalf.
The main difference is location. Pleural mesothelioma develops in the lining of the lungs and chest cavity, which is why it often causes coughing, chest pain, and shortness of breath. Peritoneal mesothelioma develops in the lining of the abdominal cavity, which is why it often causes abdominal pain, swelling, and digestive changes. Both types are caused by asbestos exposure, but they are treated differently and can carry a different prognosis.
It is uncommon, but medical literature has documented cases in which mesothelioma appears in both the pleura and the peritoneum at the same time or at different points in a patient’s care. This is sometimes described as synchronous or metachronous disease. If you are diagnosed with more than one form of mesothelioma, your care team can help you understand how that may affect your treatment plan.
Asbestos exposure is identified in the large majority of pleural mesothelioma cases, but it is confirmed in a smaller share of peritoneal mesothelioma cases, according to oncologists at MD Anderson Cancer Center. This does not mean asbestos was not involved. It often means the exposure history is harder to document, which is why working with an attorney experienced in asbestos litigation can make a meaningful difference in building your case.
Doctors typically start with imaging tests such as a CT, MRI, or PET scan, along with blood work, to look for signs of a tumor. A biopsy is required to confirm mesothelioma in either location. For pleural mesothelioma, doctors may draw fluid from around the lungs, while peritoneal mesothelioma is often confirmed through a fluid sample or biopsy taken from the abdominal cavity.
The type of mesothelioma you have does not determine whether you may have a legal case, since both pleural and peritoneal mesothelioma are caused by asbestos exposure. It can, however, affect the medical evidence and treatment costs an attorney uses to help calculate the compensation you may be entitled to pursue. An asbestos litigation attorney can review your diagnosis and exposure history to help you understand your options.
Yes. Family members who handled a worker’s asbestos-contaminated clothing, hair, or tools may have been exposed to asbestos fibers themselves, and secondhand exposure can lead to either pleural or peritoneal mesothelioma years or even decades later. If you developed mesothelioma through secondhand exposure to a family member’s work, you may still be able to pursue compensation from the companies responsible.
If you or a loved one has been diagnosed with pleural mesothelioma, peritoneal mesothelioma, or another asbestos-related disease, you do not have to navigate your medical and legal options alone. Our team can help you understand how your specific diagnosis may affect the compensation you and your family could be entitled to pursue, and we can begin investigating your history of asbestos exposure right away.
The sooner you reach out, the sooner our attorneys can begin protecting your rights and building your case while you focus on your health and your family. Contact The Williams Law Firm, P.C. today through our contact page to schedule a free, no-obligation consultation.
As the founding partner of Williams Law Firm, Joseph P. Williams has dedicated over 30 years to representing mesothelioma victims and their families. His firm has recovered hundreds of millions of dollars for those affected by asbestos exposure, offering personalized, aggressive legal advocacy. Based in New York, Williams Law Firm provides free consultations and handles cases nationwide.
