| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| [M] Small cell osteosarcoma | Is a | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some |  | 
| Osteosarcoma of bone | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Osteosarcoma of bone | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of pelvis (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 2 | 
| Primary osteosarcoma of pelvis (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 2 | 
| Primary osteosarcoma of pelvis (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 3 | 
| Primary osteosarcoma of bone of jaw (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of articular cartilage of jaw (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 2 | 
| Primary osteosarcoma of articular cartilage of jaw (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 3 | 
| Primary osteosarcoma of bone of limb (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of articular cartilage of limb (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 2 | 
| Primary osteosarcoma of articular cartilage of limb (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 3 | 
| Primary osteosarcoma of articular cartilage of pelvis (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 2 | 
| Primary osteosarcoma of articular cartilage of pelvis (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 3 | 
| Osteosarcoma, limb anomalies, erythroid macrocytosis syndrome | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 3 | 
| Osteosarcoma, limb anomalies, erythroid macrocytosis syndrome | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 4 | 
| Primary osteosarcoma (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of articular cartilage of pelvis (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of articular cartilage of lower limb (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Osteosarcoma of bone of head (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of articular cartilage of jaw (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of bone of right lower limb (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of bone of right foot | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of bone of left foot (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of bone of left lower limb | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of vertebral column | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of mandible | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of bone of left hand (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of bone of right hand | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of bone of left upper limb (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of bone of right upper limb (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of left scapula (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 | 
| Primary osteosarcoma of right scapula (disorder) | Associated morphology | False | Osteosarcoma, no International Classification of Diseases for Oncology subtype | Inferred relationship | Some | 1 |