| Outbound Relationships | Type | Target | Active | Characteristic | Refinability | Group | Values | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Neoplasm of vertebral column | false | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Neoplasm of back | false | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Neoplasm of sacrum | false | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Primary malignant neoplasm of coccyx | false | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Malignant neoplasm of pelvic bones, sacrum and coccyx | true | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Associated morphology | Neoplasm | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Finding site | Structure of innominate bone and/or sacrum and/or coccyx | true | Inferred relationship | Existential restriction modifier | 1 |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Finding site | Bone structure of coccyx | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Finding site | Bone structure of sacrum | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Associated morphology | Malignant neoplasm, primary | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Neoplasm of coccyx | false | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Disorder of sacrum | false | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Primary malignant neoplasm of vertebral column | false | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Primary malignant neoplasm of pelvic bone | false | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Malignant neoplasm of coccygeal vertebra | false | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Finding site | Structure of innominate bone and/or sacrum and/or coccyx | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Finding site | Bone structure of sacrum | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Finding site | Bone structure of coccyx | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Associated morphology | Malignant neoplasm, primary | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Primary malignant neoplasm of lower limb | false | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Primary malignant neoplasm of bone | true | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Is a | Primary malignant neoplasm of pelvis | true | Inferred relationship | Existential restriction modifier |  |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Associated morphology | Malignant neoplasm | true | Inferred relationship | Existential restriction modifier | 1 |  | 
| Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Pathological process | Malignant proliferation of primary neoplasm | true | Inferred relationship | Existential restriction modifier | 1 |  | 
| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Carcinoma of pelvic bones, sacrum and coccyx | Is a | False | Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Inferred relationship | Existential restriction modifier |  | 
| Primary malignant neoplasm of coccyx | Is a | False | Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Inferred relationship | Existential restriction modifier |  | 
| Primary malignant neoplasm of ilium | Is a | True | Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Inferred relationship | Existential restriction modifier |  | 
| Primary malignant neoplasm of ischium | Is a | True | Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Inferred relationship | Existential restriction modifier |  | 
| Primary malignant neoplasm of pelvic bone | Is a | False | Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Inferred relationship | Existential restriction modifier |  | 
| Primary malignant neoplasm of pubis | Is a | True | Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Inferred relationship | Existential restriction modifier |  | 
| Primary osteosarcoma of pelvis | Is a | True | Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Inferred relationship | Existential restriction modifier |  | 
| Ewing sarcoma of bone of pelvis | Is a | False | Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Inferred relationship | Existential restriction modifier |  | 
| Primary chondrosarcoma of bone of pelvis | Is a | True | Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Inferred relationship | Existential restriction modifier |  | 
| Primary carcinoma of pelvic bones, sacrum and coccyx | Is a | True | Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Inferred relationship | Existential restriction modifier |  | 
| Primary Ewing sarcoma of bone of pelvis | Is a | True | Primary malignant neoplasm of pelvic bones, sacrum and coccyx | Inferred relationship | Existential restriction modifier |  |