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Table 1 Overview of the described intermediate types between osteosarcoma and osteoblastoma in human literature

From: A complex histopathological challenge: suspicion of an osteoblastoma-like osteosarcoma arising from the second thoracic vertebra in a cat

Source Definition
Schajowicz and Lemos (1976) [15] Malignant osteoblastoma
Mirra and others (1976) [16] Pseudomalignant osteoblastoma
Revell and Scholtz (1979) [17] Aggressive osteoblastoma
Dorfman and Weiss (1984) [18] Subclassification in:
1. low-grade osteoblastoma-like osteosarcomas
2. pseudomalignant osteoblastoma
3. malignant transformation of initially benign osteoblastoma to a high-grade malignant osteosarcoma
4. locally aggressive/ malignant osteoblastoma
Bertoni and others (1985) [19] Osteosarcoma resembling osteoblastoma
Bertoni and others (1993) [20] Osteoblastoma-like osteosarcoma
Bertoni and others (1993) [21] Osteoblastoma with cartilaginous matrix
De Oliveira and others (2007) [22] Atypical osteoblastoma