osteoblastoma

(redirected from giant osteoid osteoma)
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osteoblastoma

 [os″te-o-blas-to´mah]
a benign, painful, rather vascular tumor of bone marked by formation of osteoid tissue and primitive bone.

os·te·o·blas·to·ma

(os'tē-ō-blas-tō'mă),
An uncommon benign tumor of osteoblasts with areas of osteoid and calcified tissue, occurring most frequently in the spine of a young person.

osteoblastoma

A bone lesion which is traditionally defined as a benign tumour of highly vascularised osteoblastic stroma, which is most common between age 5 and 25, and often located in vertebrae.
 
DiffDx
• Osteoid osteoma: Osteoblastomas are larger (over 2 cm in diameter), more axial in location, and lack imaging appearance of OOs.
• Osteosarcoma: Osteoblastomas are non-invasive, lack cartilage, have an osteosclerotic rim and looser cellularity.
• Pseudomalignant osteoblastoma: Osteoblastomas lack plump osteoblasts with “ancient change”—large nuclei with smudged nuclei.

os·te·o·blas·to·ma

(os'tē-ō-blas-tō'mă)
An uncommon benign tumor of osteoblasts with areas of osteoid and calcified tissue, occurring most frequently in the spine of a young person.