May Be Caused by

 Common

Arthritic subchondral cyst

Bone cyst

Bone infarct

Chondroblastoma

Cortical desmoid

Cystic osteomyelitis

Enchondroma

Fibrous cortical defect

Fibrous dysplasia

Nonossifying fibroma

Osteofibrous dysplasia

Osteoid osteoma

Periosteal desmoid

Traumatic subchondral cyst

 Uncommon

Brucellosis

Chondromyxoid fibroma

Clear cell chondrosarcoma

Fungal osteomyelitis

Hydatid disease

Intraosseous ganglion

Langerhans cell histiocytosis

Lipoma

Liposclerosing myxofibrous tumor

Mycetoma

Osteoblastoma

Syphilis

Tuberculosis

Yaws