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Boards Orthopaedics
Bone Lesions
26
Medical
Professional
06/26/2016

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Cards

Term
Small Round Blue Cells (4)
Definition
1. Infection- Polymorphic
2. Ewings- Monomorphic
3. Langherhans- Mostly Monomorphic
4. Rhabdomyosarcoma
Term
Age 5-10
Definition
Langerhans
UBC
NOF
ABC
Chondromyxofibroma
Enchondroma
Fibrous Dysplasia
Term
Langerhans Cell Histiocytosis
Definition
Age 5-10
Blue Cells are clef or elongated
Punched out cranial lesion
Vertebra plana
Local treatment is observe or steroid
Systemic is chemo
Term
UBC
Definition
Age 5-10
Metaphyseal up to growth plate and width of native bone
No treatment for pathologic fx
Wont show pathology
Term
ABC
Definition
Age 5-10
Aneurysmal
Fluid Line
Blood in cavity
Curette
Term
Chondromyxofibroma
Definition
Age 5-10
Proximal tibia and looks like ABC
Histo w/out blood.
Bloc Excision
Term
Enchondroma
Definition
Age 5-10
Hand and feet
Observe or curretage
No chondrosarc in hands or feet of peds
Term
Fibrous Dysplasia
Definition
Ground Glass
Bland cellular background with random osteoid
Diffuse polyostotic
Cafe Au lait (coast of Maine)
GNAS Affects cAMP
Bisphosphonates or operate on fx
Term
Age 11-25
Definition
Osteosarcoma
Ewings
Telangiectic Osteosarcoma
Term
Osteosarcoma
Definition
Abnormal mitotic figure often making bone
Around Knee
Sunburst, codmans triangle
Chemo and Wide resection
Term
Telangiectic Osteosarcoma
Definition
Equal survival to Osteosarcoma
Blood cavities
Term
Ewings
Definition
Monomorphic small blue cells, CD99+
PNET
Onion Skinning
Chemo+ Wide resection
Term
26-50 yoa
Definition
Giant Cell
Lymphoma
Term
Giant Cell
Definition
Abundance of multinucleated giant cells
Metaphyseal/Epiphyseal, up to subchondral
Currettage and Stabilization
Term
Lymphoma
Definition
Little Blue cell, Monomorphic
Hx of Lymphoma
Term
>50 yoa
Definition
Chondrosarcoma
Dedifferentiated chondrosarcoma
Malignant Fibrous Histiocytoma
Myeloma
Metastatic Carcinoma
Term
Chondrosarcoma
Definition
Normal Bone surrounded by cartilage
Most common Primary
Calcification in lesion and destructive
Wide resection
Term
Dedifferentiatied chondrosarcoma
Definition
Poor Prognosis
Hypercellular abutting hypocellular
Wide Resection
Term
Malignant Fibrous Histiocytoma
Definition
Very aggressive lesion not metastatic
No bone formation
Preop chemo and resection
Term
Chondroblastoma
Definition
Epiphyseal in youngish people
Open or nearly open physis
Curettage
Term
Clear Cell
Definition
Over 30
Similar to chondroblastoma
Term
Osteofibrous dysplasia/Adamantinoma
Definition
Tibial in the cortex
OFD is teenager
Older is Adamantinoma
Wide Resection
Term
Chordoma
Definition
Spine/Sacrum Anteriorly
Soap Bubbles
Term
Osteoid Osteoma/Osteoblastoma
Definition
<2cm is Osteoma
Painful Scoliosis is common
Radiofrequency ablation in pain
Target cells
Term
Pagets
Definition
Increased Osteoclast
Osteoclasts cutting bone
AD 5th decade
Bowing of femur. Disorganize multiple lines
Bisphosphonates
Term
Parosteal
Definition
Bland Stroma and Bony Trabeculae
Well differentiated on bone
Resection
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