Ct findings in orbital tumours.pptx
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The document discusses CT findings for various orbital tumors: - Cavernous hemangioma appears as a well-demarcated intraconal mass behind the globe. Capillary hemangioma shows low flow prominence with no tissue disturbance or bone erosion. Orbital lymphoma appears as homogeneous masses conforming to the globe or in the lacrimal gland fossa. Retinoblastoma over 80% show calcification with only small tumors devoid of it. Rhabdomyosarcoma is characterized by soft tissue density, enhancement with contrast, and bone destruction. Optic nerve glioma and meningioma involve the optic nerve seen on high-resolution CT. Optic nerve sheath meningioma has an iso
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- 1. CT FINDINGS IN ORBITAL TUMOURS -R.SREENUPRIYA 86
- 2. CAVERNOUS HEMANGIOMA • In this image, the axial (top) and coronal (bottom) CT scans show a well- demarcated intraconal mass behind the left globe. • The mass is a cavernous venous malformation.
- 3. CAPILLARY HEMANGIOMA • On CT, the lesion shows a low flow prominence with no disturbance of surrounding tissue and no bony erosion.
- 4. ORBITAL LYMPHOMA In this image, the first coronal CT scan (left) shows a homogeneous mass conforming to the globe (red arrow). The second coronal CT scan (center) shows a well-demarcated mass in the right lacrimal gland fossa (blue arrow). The axial CT scan (right) shows a homogenous lacrimal fossa mass conforming to the right globe (yellow arrow).
- 5. RETINOBLASTOMA • Over 80% of tumours show calcification. • The degree of calcification appeared to depend upon tumor size; only small tumors were devoid of calcification.
- 6. RHABDOMYOSARCOMA On CT scan, rhabdomyosarcoma is characterized by soft tissue density, enhancement with contrast, and bone destruction.
- 7. OPTIC NERVE GLIOMA The optic nerves are well demonstrated by high-resolution computed tomography. Involvement of the optic nerve by optic gliomas and optic nerve sheath meningiomas is well known.
- 8. OPTIC NERVE SHEATH MENINGIOMA The CT shows an isoattenuated intraconal orbital mass surrounding the left optic nerve with punctuate calcification. TRIPLE SIGN can be seen.
- 9. DERMOIDS On CT, a dermoid typically has a hyper-dense wall and a hypo-dense cavity which remains non-enhancing with contrast.
- 10. EPIDERMOID On computed tomography (CT) scans, the majority of epidermoid cysts are hypodense and not enhanced with contrast material as cystic contents are normally filled with debris, keratin, water, and cholesterol.
- 11. TERATOMA
- 12. THANK YOU
- 13. BIBLIOGRAPHY AK KHURANA TEXTBOOK OF OPHTHALMOLOGY PARSON’S DISEASES OF THE EYE