INFANTILE AND ADULT FIBROSARCOMAS OF THE SOFT TISSUES

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Abstract
Histologic sections of 68 soft‐tissue sarcomas initially diagnosed as Abrosarcoma were reviewed, and 36 were excluded because of revised diagnosis. The tumors from the remaining 32 patients were analyzed clinicopathologically, and were classifled into two types; the adult type (22 cases) and the infantile type (10 cases). The adult type Abrosarcoma occurred in adults aged 25 to 67 years and consisted of spindle‐shaped Abroblastic cells which formed interlacing bundles accompanied by variable amounts of collagen or reticulin fibers. The infantile Abrosarcoma affected children below the age of seven years in this series and was characterized by proliferation of immature fibroblasts forming indistinct bundles, frequently exhibiting areas of an angiosarcoma‐like pattern and cavernous blood vessels. The authors expressed the view that infantile Abrosarcoma should be separated from adult Abrosarcoma, because between these two types of Abrosarcoma there were marked differences in the histologic feature as well as in the age, sex and anatomical distributions. ACTA PATH. JAP. 29: 377–388, 1979.
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