Aggressive fibromatosis, also called desmoid tumor, is a type of fibrous tumor. This tumor grows in the fascia (a band of connective tissue) or aponeurosis (a type of flat tendon), and it is caused by too many fibroblasts and myofibroblasts cells. It does not clearly separate from nearby tissues, making it hard to remove and often comes back. Doctors study nuclear β-catenin expression and CTNNB1 gene mutation to tell it apart from other similar cell growths. This study looks at the features, outcomes, and types of these tumors in the abdominal wall by reviewing past patient records and tissue samples. It also checks how surgery affects patients' lives afterward.

• Study uses data from multiple hospitals to understand the disease better.
• Participants need to have had surgery for this tumor and agree to join.
• The study involves reviewing past medical records and following up via phone or WeChat.