Bone Tumors Brant Flashcards
Most common bone lesion
Nonossifying fibroma (NOF) or fibroxanthoma >2cm
fibrous cortical defect
Metaphysis
Thin,sclerotic border that is scalloped and slighly expansile
Nonossifying fibroma
Osteoblastas commonly occur in
Posterior elements of vertebral bodies
Well defined lytic
Central location
Less than 30 yo
Solitary bone cyst
Benign
Exclusive in the inferior surface of the calcaneus
Solitary bone cyst
Lytic lesion with calcification
Occur in epiphysis
Less than 30 yo
Chondroblastoma
Wide transition zone
Malignant
Narrow transition zone
Benign
Choldhood primary malignant tumors of bone
Osteosarcoma
Ewings sarcoma
Malignant bone tumors after 40 yo
Mets
Multiple myeloma
Chonrosarcoma
Almost all tumors have low signal on t1w1, which become high intensity in T2 except some
Malignant fibrous histiocytomas
Desmoid tumor
Low signal on both T1 and T2
Any tumor with calcification will be low in signal on both T1 and T2
Low both T1 and T2
Hemangiomas in MRI
High in both T1 and T2
MC malignant primary tumor
Osteosarcoma
Osteosarcoma on mR
Large soft tissue component with heterogenous high and low signals on T1 and T2
Destructive lesions with obvious sclerosis
Metaphysis of child
Osteosarcomat
Permeative( multiple small holes) in the diaphysis of a ling bone in child
Ewing sarcoma
Onion slin typemof periositis
Ewings sarcoma
Osteosarcoma that originates in the periosteom and grows outside the bone
Densest calcification is central and periphery is faintly calcified
Parosteal osteosarcoma
Sunburst periositis in the diaphysis
Ewing sarcoma
Amorphous snowflake calcification in >40 yo.
Chondrosarcoma
Chondrosarcoma vs enchondroma?
MRI
With DT mass or swelling- chondrosarcoma
Common malignant bone tumors in 30-40yo
GCT, parosteal sarcoma, malignant fibrous histiocytoma, primary lymphoma of bone
The only malignant tumor that can involve a large amount of bone while the patient is asymptomatic
Primary lymphoma of bone( reticulum cell sarcoma)
Primary lymphoma
Moth eaten or ewing sarcoma like appearance
Typical metastatic renal cell ca
Lytic lesion in the diaphysis of femure
Never blastic
Onemif the lesions that is not characteristically hot on radionuclide bone scan
Myeloma
Multiple calcific loose bodies in hip joint
Synovial osteochondromatosis
Irregular lytic lesions, predominantly cortical in nature with phleboliths
Hemangiomas
Benign soft tissue process
Never has calcifications
MRI appearance: low signal lining the synovium on T1 and T2
Pigmented villododular synovitis
Typical metastatic renal cell ca
Lytic lesion in the diaphysis of femure
Never blastic
