General
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• Uncommon
• Within bone, but close to a joint space at ends of long bones; often in distal tibia or proximal humerus
• May be an extension of soft tissue ganglion

Radiology images
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Intraosseous ganglion

Treatment
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• Simple curettage

Gross description
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• Cyst surrounded by condensed bone, often multiloculated with gelatinous content and fibrous tissue wall

Micro description
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• Cystic space with no epithelial lining
• May be filled with mucoid material or foamy macrophages

Differential diagnosis
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• Periarticular cyst associated with degenerative joint disease
• Solitary bone cyst

Additional references
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• Am J Surg Pathol 1982;6:207

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