Enchondroma

Patient B - 3rd proximal phalanx

• Benign cystic bone lesion which contains calcified chondroid matrix (Rings and Arcs) except when in the phalanges
• Result of cartilage rests being left behind as growth plate advanced
• Difficult to differentiate between Chondrosarcoma, which can be painful

Patient A

Patient A

Patient A

Differential Diagnosis

Fog Machines or Fegnomashic

• Fibrous dysplasia
• Osteoblastoma
• Giant cell tumor
• Metastatic disease and Myeloma
• Aneurysmal bone cyst
• Chondroblastoma, Chondromyxoid fibroma
• Hyperparathyroidism
• Infection
• Nonossifying fibroma
• Enchondroma, Eosinophilic granuloma
• Solitary bone cyst

Ollier's Disease

• Multiple enchondromas with a flame-shaped appearance that run perpendicular to the physes
• Sarcomatous degeneration in 25%

Maffucci Syndrome

Multiple enchondromas with soft tissue hemangiomas and increased rate of malignant transformation.