Temporal bone chondroblastoma: big and small.

Department of Otorhinolaryngology, National University Hospital, Singapore.
The Journal of Laryngology & Otology (Impact Factor: 0.7). 01/1995; 108(12):1115-9. DOI: 10.1017/S0022215100129068
Source: PubMed

ABSTRACT Chondroblastoma represents approximately one per cent of all primary bone tumours. It is even rarer in the temporal bone and so far only 34 cases have been reported. We report here two cases with chondroblastoma of the temporal bone. The first case was discovered as a small lesion of the attic and root of zygoma. It was removed via mastoidectomy and reconstruction of the bony defect achieved normal external ear canal anatomy and hearing post-operatively. The second case presented as an advanced tumour involving the infratemporal fossa and parapharyngeal space. It was treated surgically via the infratemporal fossa approach. As clear surgical margins were not obtained, post-operative radiotherapy was also given to minimize the chance of recurrence.

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    ABSTRACT: We report a case of chondroblastoma of the temporal bone occurring in a 28-year-old man. Chondroblastoma is a benign bone tumor that classically occurs in the epiphysis of long bones in young people. The temporal bone is an unusual location. Computed tomography (CT) showed a mass in the temporal bone with bone erosion and destruction. On magnetic resonance (MR) imaging, the tumor showed isointensity to the brain on T1-weighted (T1W) images, heterogeneous high-signal intensity on short-inversion-time inversion recovery (STIR) images, and the central region was more hyperintense than the marginal region. On a dynamic gadolinium-enhanced fat-suppression study (dynamic study), the central region of the tumor showed a gradual increase in intensity toward the center. Pathologically, the central region of the tumor contained abundant cartilaginous material.
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