Tumours of the orbit

The orbital cavity is bounded -

Medially - by the bones forming the outer wall of the ethmoid and sphenoid sinuses

Optic foramen

Optic foramen

Superiorly

- by the floor of the anterior fossa Superior orbital fissure

Laterally

- by the zygoma, frontal bone and greater sphenoid wing em Inferiorly — by the roof of the maxillary sinus

PATHOLOGY

Tumours may arise from any of the structures lying within or around the orbit.

- RETINOBLASTOMA: — highly malignant tumour of childhood

- MELANOMA

- GLIOMA (pilocytic astrocytoma): very slow growth (see page 336)

- NEUROFIBROMA NEUROMA

NON-NEOPLASTIC ORBITAL LESIONS

- RHABDOMYOSARCOMA:

malignant childhood tumour with rapid growth and local spread

- BRONCHIAL Ca Children

- NEUROBLASTOMA

- EWING'S SARCOMA

- LEUKAEMIA

- 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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