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Table 2 Classification criteria (staging) for EAC squamous cell carcinoma

From: External and middle ear diseases: radiological diagnosis based on clinical signs and symptoms

T1 Tumour limited to EAC without bone erosion and soft tissue involvement
T2 Tumour with limited EAC osseous erosion or soft tissue involvement
T3 Tumour eroding osseous EAC with limited soft tissue/middle ear/mastoid involvement
T4 Tumour eroding deeper inner ear structures/temporomandibular joint/deep soft tissue extension/facial nerve paresis/distant metastases