What type of tumor is characterized by large infiltrative masses consisting of clonal proliferation of myofibroblasts?

Desmoid tumors, also known as aggressive fibromatosis, are characterized by large infiltrative masses that result from the clonal proliferation of myofibroblasts. These tumors are benign but can be locally aggressive, often infiltrating surrounding tissues without forming well-defined edges. The presence of myofibroblasts, which are specialized cells involved in wound healing, contributes to the tumor's distinctive infiltrative behavior.

Desmoid tumors can arise in various locations, including the abdomen, shoulder, and extremities, and they may occur sporadically or in association with familial syndromes such as Gardner's syndrome. The infiltrative nature of these tumors underlines the importance of surgical resection, although complete removal can sometimes be challenging due to the tumor's tendency to invade adjacent structures.

While fibromas and myofibromas consist of fibrous tissue and myofibroblasts, they usually do not exhibit the same infiltrative and aggressive growth pattern as desmoid tumors. Liposarcoma is a malignant tumor that arises from adipose tissue, which does not align with the characteristics specific to desmoid tumors. Thus, the unique features of desmoid tumors truly set them apart, leading to their classification as tumors resulting from my