D10-D36: Benign neoplasms

D20: Benign neoplasm of soft tissue of retroperitoneum and peritoneum

Benign neoplasms of the soft tissue of the retroperitoneum and peritoneum refer to non-cancerous growths that develop in the soft tissues within the area behind the abdominal cavity (the retroperitoneum) or within the lining of the abdominal cavity (the peritoneum). These neoplasms can grow from different types of tissues, such as fat, muscle or connective tissues. They are termed 'benign' because, unlike 'malignant' or cancerous tumors, they don't spread to other parts of the body. However, depending on their size and location, these benign neoplasms can still cause symptoms such as abdominal pain, nausea and changes in bowel habits. The cause of these neoplasms is often unclear but they can be related to genetic factors, previous radiation therapy or long-term inflammation. Over time, these neoplasms can become larger, causing more noticeable symptoms, but the rate of growth can vary widely.