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Fig. 6.3. Nasopharyngeal angiofibroma. a-b Nasopharyngeal angiofibromas are large, white, firm, bulging tumours covered by respiratory mucosa. c-d Abnormal large muscular and smaller sinusoidal vessels are embedded in a fibrous and partly sclerotic stro-
ma. The muscular vessels exhibit irregular muscle walls with varying thickness and arbitrary arrangement of the individual smooth muscle cells. e-f The stroma is either fibrous or myxoid with stellate or spindled cells
Fig. 6.2. Salivary gland anlage tumour. a-c Salivary gland anlage tumours have an intact surface epithelium, which may be partly keratinized. The branching epithelial proliferations show ducts filled with proteinaceous casts. The stroma is myxoid and contains numerous plasma cells and lymphocytes. d-e There are sol-
id squamous areas with keratin-filled cysts and calcifications. f-g Other areas are dominated by proliferations of spindle cells in solid, fascicular and nested arrangement with occasional ductal and cystic elements. Haemorrhage is common
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