[Aggressive fibromatosis--a surgical problem disease].

The aggressive fibromatosis is a surgical problem disease. Two remarkable cases serve as examples to demonstrate the aggressive forms of extraabdominal fibromatosis. There is a tendency to locally invasive destructive growth without metastasising at any time and a markedly high relapse rate after surgery, a tendency that showed up clearly in our patients, too. The very multivarious nomenclature points out that about histiogenesis, pathogenesis and benignity of this excrescence still exists great obscurity. We report on the pathology and clinic of an aggressive fibromatosis of the thyroid gland region and of a thoracal aggressive fibromatosis in the right shoulderblade-region.