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Use caution when assessing periosteal reactions, as many benign lesions such as infection, EG (Figure 1), and aneurysmal bone cysts can result in an aggressive-appearing periostitis.
To our knowledge, this is the first report of an aneurysmal bone cyst in a columbiform bird.
The pathologic examinations of the surgically obtained specimens were all in favor of GCT except one that was interpreted as an aneurysmal bone cyst because of the presence of vascular spaces and osteoclastic granuloma.
Radiological and histological features of GCRGs may overlap those of other giant cells containing lytic lesions, such as giant cell tumours (GCTs), aneurysmal bone cysts, and the brown tumour of hyperparathyroidism.
Fluid: Fluid-fluid levels seen on x-rays of cysts have been reported to be reliable evidence of blood in an aneurysmal bone cyst (ABC).
Bertoni et al (2) attempted to exclude from their 1988 series any lesions showing definite histologic evidence of "metaphyseal fibrous defect, benign fibrous histiocytoma, aneurysmal bone cyst, simple bone cyst, fibrous dysplasia, osteomyelitis, histiocytosis X, a storage disease, hyperlipoproteinemia, or giant cell tumor.
Giant cell tumors, solitary bone cysts, aneurysmal bone cysts, fibrous dysplasia, bone metastasis, neurofibromatosis, and tuberculosis of the bone should be considered in the differential diagnosis of osseous hydatid disease.
The radiographic features of GCT and aneurysmal bone cyst may overlap and will not always allow radiographic distinction.