1. Adipous tissue replaced most of the stroma and was diagnosed as pleomorphic liposarcoma.

2. Based on examples of a lipoma, a well-differentiated liposarcoma, a myxoid liposarcoma, and an aggressive angiomyxoma it is demonstrated in the present paper how cytogenetic investigation can be used as an additional tool for an improved diagnosis of adipose tissue tumors.

3. The following five tumors were transplantated over years in continous lines: a liposarcoma, a rhabdomyosarcoma, a fibrosarcoma, an alveolar adenocarcinoma of salivary gland, and a solid carcinoma.