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tnm staging cancer staging ajcc oral cancer odontogenic tumours jaw bone lesions maxilla mandible odontogenic cysts pet/ct ct pet mri fusion imaging contrast methods contrast material sialography tmj contrast radiography dental age forensic radiology age estimation bells palsy amyotrophic lateral sclerosis seizure disorder als gbs neuromuscular disease cerebrovascular accident cerebral palsy multiple sclerosis motor neuron disease radiation protection dental radiology dosimetry bleeding disorders dentistry hemophilia dental care oral manifestations endocrine disorders malignant melanoma oral depigmentation melanin oral pigmentation peutz-jegher's syndrome