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Contents

6.1 Embryological Development of the Nasopharynx and Waldeyer's Ring 172

6.2 Nasopharynx 173

6.2.1 Anatomy and Histology 173

6.2.2 Congenital Developmental Anomalies 173

6.2.2.1 Nasopharyngeal Branchial Cleft Cysts 173

6.2.2.2 Tornwaldt's Cyst 173

6.2.2.3 Rathke's CleftCyst/Ectopic Pituitary Tissue . . . . 174

6.2.2.4 Craniopharyngioma 174

6.2.2.5 Heterotopic Brain Tissue/Encephalocele 174

6.2.3 Congenital Tumours 174

6.2.3.1 Salivary Gland Anlage Tumour 175

6.2.3.2 Hairy Polyp 175

6.2.3.3 Congenital Nasopharyngeal Teratoma 175

6.2.4 Benign Tumours and Tumour-Like Lesions 175

6.2.4.1 Nasopharyngeal Angiofibroma 175

6.2.4.2 Respiratory Epithelial

Adenomatoid Hamartoma 178

6.2.4.3 Nasopharyngeal Inverted Papilloma 178

6.2.4.4 Solitary Fibrous Tumour 179

6.2.4.5 Paraganglioma 179

6.2.4.6 Meningioma 179

6.2.4.7 Glandular Retention Cysts 179

6.2.5 Nasopharyngeal Carcinoma 180

6.2.5.1 Non-Keratinising Nasopharyngeal

Carcinoma 180

6.2.5.2 Keratinising Nasopharyngeal Carcinoma 182

6.2.6 Nasopharyngeal Adenocarcinoma 182

6.2.6.1 Salivary Gland-Type Adenocarcinoma of the Nasopharynx 182

6.2.6.2 Papillary Adenocarcinoma of the Nasopharynx 182

6.2.7 Malignant Non-Epithelial Tumours of the Nasopharynx 183

6.2.7.1 Chordoma 183

6.2.7.2 Sarcoma 183

6.3 Waldeyer's Ring 183

6.3.1 Anatomy and Histology of Waldeyer's Ring 183

6.3.2 Congenital Anomalies of Waldeyer's Ring 184

6.3.3 Tonsillitis 184

6.3.3.1 Bacterial Tonsillitis 184

6.3.3.2 Viral Tonsillitis 185

6.3.4 Benign Tumours of Waldeyer's Ring 187

6.3.4.1 Squamous Papilloma 187

6.3.4.2 Lymphangiomatous Tonsillar Polyp 187

6.3.5 Carcinomas of Waldeyer's Ring 187

6.3.6 Malignant Lymphomas of Waldeyer's Ring 189

6.3.6.1 Mantle Cell Lymphoma 189

6.3.6.2 Extranodal Marginal Zone B-Cell Lymphoma of Mucosa-Associated Lymphoid Tissue 190

6.3.6.3 Extranodal NK/T-Cell Lymphoma,

Nasal Type 190

6.3.6.4 Hodgkin's Lymphoma 190

6.3.6.5 Extramedullary Plasmacytoma 190

6.3.7 Systemic Disease Affecting Waldeyer's Ring . . . . 190

References 191

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