Multinucleated cells were also present. Sections revealed round inflammatory cell infiltration in the peripheral area but no necrosis was present. The second specimen showed lamellar bone with eroded trabeculae and some bone invasion. These tumors are rare in children and only 17 cases in the pediatric age group have been reported.10 Liposarcomas in adults arising from the pleural surfaces are extremely rare. The tumor size and histologic subtype are important prognostic denominators.
Mixed forms occur.
Costa et al.8 have classified all well-differentiated liposarcomas in the category of Grade 1. Grade 1 sarcomas exhibit well-differentiated cytological features, absence of significant pleomorphism, absence of necrosis and exceedingly low mitotic activity. Such tumors tend to recur locally rather than metastasize. Some of these recurrences have dedifferentiated appearance and patients may die as a result of recurrence. We performed radical resection of the tumor.