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종결 Case No. 580 2021-02-01~2021-02-28

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Period	2021-02-01~2021-02-28
Diagnosis	Giant cell tumor with secondary aneurysmal bone cyst of temporal bone
Gender	M F
Age	43
Clinical information	M/43Y HA, left side hearing loss What is your diagnosis?
Discussion	Giant cell tumor with secondary aneurysmal bone cyst of temporal bone Definition: Benign intraosseous neoplasm arising from multinucleated giant cells Imaging findings: - CT --Expansile intraosseous soft tissue mass with thinned surrounding cortical shell --Thin surrounding cortical margin -- Overlying cortical shell may be focally dehiscent --Occasional scant matrix calcification - MRI --T2WI: Mixed iso- to hyperintense, but occasionally diffusely hypointense (due to hemosiderin, calcification), markedly hypointense rim --Post-contrast T1WI: Marked enhancement, hypointense rim & prominent internal enhancement Differential diagnoses: Aneurysmal bone cyst (ABC) Chordoma/Chondrosarcoma Fibrous dysplasia Plasmacytoma
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