A patient comes in expressing pain in their right shoulder. After performing a bone biopsy, it was found that they had severe osteolysis in their scapula. A curettage v bone graft was performed. The patient's pain persisted and an angiogram indicate increased vasculature in the scapula. A second bone graft was performed and the patient's symptoms fell into remission. The patient was eventually diagnosed with Gorham-Stout disease. Which of the following is NOT one of the criteria for diagnosing GSD? Absence of osteoblastic reaction O Exclusion of infectious or hereditary etiology Negative histological tests for proliferation Exclusion of cellular atypia

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