MARK D. MURPHEY MD, FACR. Physician-in-Chief, AIRP. Chief, Musculoskeletal Imaging
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1 ALPHABET SOUP AND CYSTIC LESIONS OF THE BONE MARK D. MURPHEY MD, FACR Physician-in-Chief, AIRP Chief, Musculoskeletal Imaging
2 ALPHABET SOUP AND CYSTIC LESIONS OF THE BONE Giant cell tumor (GCT) Unicameral bone cyst (UBC) Aneurysmal bone cyst (ABC) Epidermoid inclusion cyst Subchondral cyst Intraosseous ganglion Post-traumatic cyst
3 GIANT CELL TUMOR (GCT) CLINICAL FEATUES Approximately 5%-10% of all biopsied primary bone tumors; 18%-23% of benign bone neoplasms Symptoms-pain and swelling often relieved by decreased activity Pathologic fracture 10% - 35%
4 GIANT CELL TUMOR CLINICAL FEATUES Adults- 80% between years More common in Chinese (20% of primary bone tumors) Rare in children 1% - 3% (<14 years) Approximately equal sex distribution F - M ratio 3:2 benign GCT M - F ratio 3:1 aggressive GCT
5 GIANT CELL TUMOR LOCATION Originate metaphyseal side of long bone growth plate and grow to subchondral bone (84% - 99%) Long tubular bones 75% - 90% About knee 50% - 65%; distal femur 23%-30%; proximal tibia 20%-25% Radius (10%-12%); humerus (4%-8%)
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12 GIANT CELL TUMOR LOCATION Originate metaphyseal side of long bone growth plate and grow to subchondral bone (84% - 99%) Long tubular bones 75% - 90% About knee 50% - 65%; distal femur 23%-30%; proximal tibia 20%-25% Radius (10%-12%); humerus (4%-8%)
13 GIANT CELL TUMOR LOCATION Spine (7%-15%) - vertebral body sacrum-thoracic-cervical-lumbar Pelvis 4%; Hands/feet - 5% Multifocal (0.5% - 1%) - skull and face (Paget disease), Goltz syndrome
14 GIANT CELL TUMOR PATHOLOGY Osteoclast like giant cells (90%) Mononuclear spindle cell stromal component Hemorrhage, necrosis and hemosiderin ABC like areas 10% - 15% Cytogenetic aberration H3F3A (92%)
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18 OSSEOUS LESIONS CONTAINING GIANT CELLS GCT/ABC/UBC NOF/CMF/OGS Brown tumor HPT/chondroblastoma Fibrous dysplasia and variants Osteoblastoma Giant cell reparative granuloma
19 GIANT CELL TUMOR RADIOLOGY Solitary eccentric geographic lytic lesion extending into subchondral bone Center of lesion-metaepiphysis Margin IB (80%-85%), IC (10%-20%), IA (1%-2% but up to 20% by CT) No mineralized matrix
20 GIANT CELL TUMOR RADIOLOGY Expansile remodeling (47%-60%) with apparent cortical permeation (33% - 50%) Septations-subperiosteal new bone Periosteal reaction unusual 10% - 30% Radiologic characteristic do not reflect clinical behavior of GCT
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37 GIANT CELL TUMOR RADIOLOGY Bone scan-doughnut sign (57%) Usually a vascular lesion (75%-90%) MRI>CT for evaluation of extent Fluid levels in cystic (ABC) components Low to intermediate intensity usually predominates on T2W images (90%-95%) in solid components
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64 SACRAL LESIONS DIFFERENTIAL DIAGNOSIS GCT/ABC Metastasis Myeloma/plasmacytoma Chordoma Neurogenic tumor
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78 GIANT CELL TUMOR TREATMENT AND PROGNOSIS Curettage and cryosurgery or en bloc resection and bone graft Local recurrence rate 40% - 60% historically Current recurrence rate 2% - 25% Denosumab medical therapy (86% response) Recurrence does not correspond to radiologic or microscopic appearance
79 UNICAMERAL BONE CYST SIMPLE BONE CYST A fluid-containing lesion lined by mesothelial (epithelial-like) cells usually arising in metaphysis of long bone adjacent to physis
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81 SIMPLE BONE CYST CLINICAL FEATURES 3% of all biopsied primary osseous neoplasms Young patients 85% <20 years M > F; 2:1 Pathologic fracture 50%
82 SIMPLE BONE CYST PATHOLOGY Clear, straw-colored fluid filled cyst Cyst lining-thin flat epithelial-like cells-mesothelial origin Complicated cysts-hemorrhage, fibro-osseous repair tissue
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86 SIMPLE BONE CYST LOCATION/ETIOLOGY Under age 20 - humerus (55% - 65%), femur (25%- 30%), tibia, fibula, radius and ulna rare Over age 20 - iliac bone/ calcaneus Cause - lymphatic or venous obstruction vs. synovial origin
87 SIMPLE BONE CYST RADIOLOGY Geographic IA lesion-originate in central metaphysis (active) Can migrate into the diaphysis (latent) Mild expansile remodeling Not infrequently multilocular
88 SIMPLE BONE CYST RADIOLOGY Pathologic fracture - Fallen fragment sign (5%) CT/MRI-noncomplicated see simple fluid CT/MRI-complicated case Soft tissue Fluid-fluid/gas-fluid level
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123 SIMPLE BONE CYSTS TREATMENT AND COURSE Spontaneous regression or heal after fracture Curettage and bone grafting Intralesional steroids (70% - 95% effective) Intralesional bone marrow or bone matrix Recurrence 20% - 40% - Increases with younger age and larger size Extremely rare-malignant transformation
124 ANEURYSMAL BONE CYST (ABC) DEFINITION The so called aneurysmal bone cyst is neither a cyst nor a neoplasm; rather it is probably a periosteal to intraosseous arteriovenous malformation not uncommonly seen in association with other well known benign and even malignant lesions Mirra JM. Bone tumors. Lea & Febiger 1989.
125 ANEURYSMAL BONE CYST CLINICAL FEATURES 1%-6% of all biopsied primary osseous neoplasms 80%-85% between ages 5 and 20 years Patients present with pain, swelling, and pathologic fracture (10% - 20%) May be associated with trauma More common in women (1.5-2:1)
126 ANEURYSMAL BONE CYST SECONDARY LESION 1% - 32% of cases Benign lesions-chondroblastoma, CMF, NOF, GCT, fibrous dysplasia, UBC, brown tumor, hemangioma, giant cell reparative granuloma Malignant lesionshemangioendothelioma, telangiectatic osteosarcoma, chondrosarcoma
127 OSSEOUS LESIONS WITH PROMINENT FLUID LEVELS DIFFERENTIAL DIAGNOSIS Aneurysmal bone cyst (only fluid levels) Giant cell tumor (to bone end, metaphyseal center) Chondroblastoma (epiphyseal center) Osteoblastoma (posterior elements spine) Telangiectatic Osteosarcoma (thick walls, osteoid CT) Fibrous dysplasia (diaphysis, ground glass )
128 ANEURYSMAL BONE CYST PATHOLOGY Gross Blood filled sponge Cavernous blood filled spaces line by fibrous walls May see chondrosseous tissue indicating repair
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136 ANEURYSMAL BONE CYST LOCATION Long tubular bone 70% - 80% Spine posterior elements-15% (thoracic, lumbar, cervical, sacral) Pelvis 5% - 10% Hands 10% - 15%
137 ANEURYSMAL BONE CYST RADIOLOGY Only osseous neoplasm named for its radiologic appearance Metaphysis (80% - 90%), eccentric medullary geographic lytic lesion Can appear central with expansion Diaphysis (10% - 20%), often surface lesions
138 ANEURYSMAL BONE CYST RADIOLOGY Expansile remodeling uneven in distribution creating one aggressive margin Spine-expansion can lead to neurologic deficits Periosteal membrane intact on CT/MRI Bone scan-peripheral activity (65%)
139 ANEURYSMAL BONE CYST RADIOLOGY Fluid levels (CT/MRI)-nonspecific representing sedimentation of blood Angiography-hypovascular lesion with localized areas of increased vascularity
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192 ALPHABET SOUP AND CYSTIC LESIONS OF THE BONE Giant cell tumor (GCT) Unicameral bone cyst (UBC) Aneurysmal bone cyst (ABC) Epidermoid inclusion cyst Subchondral cyst Intraosseous ganglion Post-traumatic cyst
193 ALPHABET SOUP AND CYSTIC LESIONS OF THE BONE MARK D. MURPHEY MD, FACR Physician-in-Chief, AIRP Chief, Musculoskeletal Imaging
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