Infratemporal Fossa

Cortical Destruction

Cortical destruction is detected at CT as a break of the mineralized bone through its whole thickness, whereas on MR a defect of the continuous hypoin-tense thickness of the cortex, replaced by solid tissue, implies invasion also of the periosteum (Maroldi et al. 1996). It can be observed in aggressive inflammatory lesions (both non-invasive and invasive fungal rhinosinusitis), some benign, but aggressive, neo plasms as inverted papilloma and juvenile angiofibroma and in malignant tumors (Som et al. 1991) (Fig. 4.4).

Infratemporal Fossa

Fig. 4.4. Squamous cell carcinoma of the left maxillary sinus. Irregular destruction of the posterolateral wall (1). Tumor spreads into the fat content of the infratemporal fossa and inferior orbital fissure (2). Arrowheads indicate the extent into the inferior limit of the superior orbital fissure. Sclerotic changes of the alveolar process (3)

Fig. 4.4. Squamous cell carcinoma of the left maxillary sinus. Irregular destruction of the posterolateral wall (1). Tumor spreads into the fat content of the infratemporal fossa and inferior orbital fissure (2). Arrowheads indicate the extent into the inferior limit of the superior orbital fissure. Sclerotic changes of the alveolar process (3)

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