fibroma abdominal fibromatosis MedDRA:10059354 Fibromatosis, Abdominal Dani Welter MESH:D018221 A relatively large mass of unusually firm scarlike connective tissue resulting from active participation of fibroblasts, occurring most frequently in the abdominal muscles of women who have borne children. The fibroblasts infiltrate surrounding muscle and fascia. (Stedman, 25th ed)