The orbital cavity is bounded -
Medially - by the bones forming the outer wall of the ethmoid and sphenoid sinuses
- by the floor of the anterior fossa Superior orbital fissure
- by the zygoma, frontal bone and greater sphenoid wing em Inferiorly — by the roof of the maxillary sinus
Tumours may arise from any of the structures lying within or around the orbit.
- RETINOBLASTOMA: — highly malignant tumour of childhood
- GLIOMA (pilocytic astrocytoma): very slow growth (see page 336)
- NEUROFIBROMA NEUROMA
NON-NEOPLASTIC ORBITAL LESIONS
malignant childhood tumour with rapid growth and local spread
- BRONCHIAL Ca Children
- EWING'S SARCOMA
- CAVERNOUS HAEMANGIOMA;LYMPHANGIOMA: common benign lesions in adults
- ORBITAL GRANULOMA (PSEUDOTUMOUR) 1 (see over)
- DYSTHYROID EXOPHTHALMOS J
- WEGENER'S GRANULOMATOSIS
- SARCOIDOSIS N.B. CAROTID-CAVERNOUS FISTULA presents
- HISTIOCYTOSIS X with a pulsatile exophthalmos.
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