Recurrent Childhood Undifferentiated High Grade Pleomorphic Sarcoma of Bone

**Semantic type:** Neoplastic Process

**Definition:** The reemergence of undifferentiated high-grade pleomorphic sarcoma of bone in childhood after a period of remission.

**Synonyms:** - Recurrent Childhood Undifferentiated High Grade Pleomorphic Sarcoma - Recurrent Childhood Undifferentiated High-Grade Pleomorphic Sarcoma of Bone - Recurrent Undifferentiated High Grade Pleomorphic Sarcoma of Bone