Prolonged follow-up of large series of patients treated for Hodgkin's disease with an intensive therapeutic approach has demonstrated an incidence of second tumors of around 5-10%. Acute leukemia is the most frequent second neoplasia, and treatments including alkylating agents and radiotherapy seem to be correlated with a higher risk of this fatal complication. Bone and soft tissue sarcomas have rarely been observed after treatment of Hodgkin's disease, and only a few cases are described in the literature. Four cases observed at the Istituto Nazionale Tumori of Milano in a large series of nearly 800 patients treated over the last two decades with different modalities are presented. One case of chondrosarcoma and 3 cases of soft tissue sarcomas were diagnosed after a median and mean interval of 50 and 70 months, respectively (range 49-96). Three patients had been treated with radiotherapy plus chemotherapy (MOPP, 2 cases; ABVD, 1 case), and one with radiotherapy alone. The site of the second tumor was always within an irradiated area, which had received a dose ranging from 10 to 43 Gy. Prognosis of secondary bone and soft tissue sarcomas is very poor. Three of our cases died 14, 15 and 19 months after diagnosis; only one patient is alive, 3 months after diagnosis of a chondrosarcoma. The problem of second tumors in patients treated for Hodgkin's disease requires a careful evaluation of aggressive treatment modalities to minimize the risks of this severe complication.