INTRA-OCULAR TUMOURS

1. INTRA-OCULAR TUMOURS

2. Retinoblastoma Definition: Retinoblastoma is a proliferation of neural cells that have failed to evolve normally. Retinal cell division continues unchecked and results in development of retinal tumour. Retinoblastoma is found in infants and very young children.

3. Epidemiology Disease is rare Frequently tumour is congenital Tumour is exclusively seen in infants and very young children Fellow eye is affected independently, not by metastasis in approximately 1/4th cases In approximately 10% cases a relative may have suffered from bilateral retinoblastoma

4. Epidemiology Presentation � usually 15 months to 24 months of age, most of the cases presents before the age of 3 years Rare after the age of 5 years 30% are bilateral and 70% are unilateral 40% are familial and 60% are non-familial

5. Epidemiology Genetic transmission � inheritance is dominant with variable gene penetrance Related to chromosomal abnormality with deletion or mutation of q14 band Mutation of Rb1 gene has been reported

6. Pathology Growth consists mainly of small round cells with large nuclei resembling the ceels of nuclear layer of retina. Many of the cells stain poorly indicating necrosis. Rosette shaped arrangement may be present, resembling rods and cones (Flexner Wintersteiner rosettes) In retinoblastoma lesions are usually multiple, with large lesion surrounded by multiple small lesions

7. Pathology Microscopically minute deposits are seen scattered in various parts of globe Tumour may grow outwards , separating retina from choroid � Exophytic tumour, condition resembles retinal detachment Or it grow inwards towards vitreous cavity � Endophytic tumour seen as polypoid masses , sometimes haemorrhage on the surface

8. Clinical Features SYMPTOMS 1. Child is brought to ophthalmologist with history of yellow /white reflex in pupillary area sometimes called leucocoria or amaurotic cat�s eye 2. Squint, usually convergent , at times divergent 3. Cataract/ Bulging eye/ large eye (buphthalmos)

9. Clinical Features Signs 1. Leucocoria 2. Squint 3. Cataract 4. Buphthalmos (large eye, raised tension, corneal edema, blue sclera) 5. Hypopyon / Proptosis / ocular inflammation 6. Mydriasis/ hyphema failed school vision test, dysmorphic appearance

10. Stages of Retinoblastoma Quiescent stage (six months to one year) Glaucomatous stage (enlargement of globe and severe pain) Stage of extra-ocular extension (globe rupture usually at limbus with rapid enlargement of fungating growth) Stage of metastasis ( first in preauricular and neighbouring lymph nodes followed by metastasis to cranial and other bones)

11. Metastasis Direct extension by continuity to the opticc nerve and brain Metastasis to other organs like liver through blood stream

12. Reese and Ellsworth Classification Based on prognosis and has predictive value to assess likelihood to success of local treatment Group I : Very favourable prognosis for retaining vision a. Single tumour less than 4 DD at or behind equator b. Multiple tumours of less than 4 DD size all at or behind the equator

13. Reese and Ellsworth Classification 2. Group II : Favourable for retaining eye sight a. single tumour 4-10 DD at or behind equator b. Multiple tumours 4 -10 DD in size , behind equator

14. Reese and Ellsworth Classification 3. Group III : possible to maintain vision a. any lesion anterior to equator b. single tumour more than 10 DD in size behind equator

15. Reese and Ellsworth Classification 4. Group IV : Unfavourable for maintenance to eye sight a. Multiple tumours some larger than 10 DD in size b. Any lesion extending anterior to ora serrata 5. Group V : Highly unfavourable for maintaining eye sight Massive tumours involving more than half retina and vitreous seeding

16. Diagnosis Clinical presentation USG � B Scan X- ray orbit, skull etc CT Scan Ant chamber fluid cytotology Biopsy (in cases of extra-ocular extension) Raise Lactic dehydrogenase activity in aqueou relative to the serum MRI for estimation of degree of differentiation

17. Treatment Prognosis of retinoblastoma if left untreated , is always bad Prognosis is fair if extra-ocular extension is avoided

18. Differential Diagnosis Pesudoglioma 1. Inflammatory deposits in the vitreous 2. Toxocariasis 3. Congenital defects (PHPV and Norrie disease, Colobomas of choroid and disc) 4. Retrolental fibroplasis 5. Cataract 6. Retinal detachment, Retinal dysplasia, tumours other than Retinoblastoma, coats� disease, Vit. Haemorrhage , uveitis

19. Treatment Small tumour Local modalities like cryotherapy (for ant lesion), Photocoagulation for posterior lesion, brachytherapy with Co 60 or 125 I and steriotactic radiation Suturing of radioactive cobalt discs � it deliver a dose of 4000 rad to summit of the tumour in one week.

20. Treatment Photocoagulation Placing a double row of confluent burns around each tumours with a photocoagulator. Repeat treatment may be required. Cryotherapy- For anteriorly located tumours. Under direct visualization freezing until ice ball incorporates entire tumour. Tumour is allowed to thaw and refreez- thaw cycle is repeated 3-4 times.

21. Treatment 2. Enucleation 3. Exenteration of the orbit 4. External beam radiation 5. Chemoreduction with chemotherapy (Vincristine, etoposide and carboplatin)

22. Malignant Melanoma Malignant Melanoma is highly malignant tumour arising from the outer layers of choroid. It is commonest intra-ocular tumour.

23. Clinical Features Adults between the age of 40 � 60 years affected. Less common amongst African and Asians

24. Symptoms Visual acuity is markedly affected when tumour is located centrally near macula In glaucomatous stage patient presents with severe pain in and around eye In stage of extra-ocular extension: growth in orbit / fungating mass In stage of metastasis: varied presentation depending on organ involved

25. Signs Tumour is primarily single and unilateral A lens shaped mass raising the Retina above It stretches the Bruch membrane which ruptures and then tumour proliferates through the opening and retinal pigment epithelium to form a globular mass in the subretinal space Lens becomes opaque as its nutrition suffers

26. Signs Tumour fills the globe then perforate the sclera Orbital extension may occur in early stage due to spread along vortex vein or ciliary vessels Orbital tissue is infiltrated with tumour cells � presenting as proptosis Lymph nodes are not commonly affected

27. Signs Distant metastasis occurs to liver and elsewhere Growth is usually pigmented but may be occasionally unpigmented ( pigments are chiefly melanin) Surface of tumour may have mottled orange and black appearance

28. Signs Flat malignant melanoma: Choroid is widely infiltrated so that a uniform thickening results with shallow Retinal Detachment

29. Clinical stages The quiescent stage The Glaucomatous stage The stage of extra-ocular extension The stage of metastasis

30. Pathology Composed of spindle shaped cells Cells may also be cylindrical or palisade-like, arranged in columns or around blood vessels Most of the tumours are of mixed type Spindle � A Spindle � B Epitheloid (most malignant) Mixed Contains variable amount of reticulin fibres

31. Differential Diagnosis Choroidal naevus Cavernous haemangioma Posterior scleritis

32. Diagnosis Ultrasonography � A and B scan Radioactive tracers- increased rate of phosphate uptake and its retaintion for longer time Fluorescein Angiography- double circulation with increased fluorescence in the mass (Indocyanine green angiography)

33. Treatment A pigmented lesion with diameter larger than 5 DD (7.5 mm) should be considered a malignant melanoma until proved otherwise Goals � eradication of tumour , maintenance of vision and cosmetically acceptable eye Tumour less than 10 mm and upto 2 mm thickeness is treated by brachytherapy using Radioactive discs of gold, cobalt 60 or iodine 125

34. Treatment For treatment of small tumour External beam radiation Cryotherapy Laser ablation Transpupillary thermotherapy For treatment of medium size tumour (10-15 mm in diameter and 3-5 mm in height) Plaque or external proton beam radiation

35. Treatment Enucleation Exenteration PROGNOSIS Disease is usually fatal in 5 years if not treated successfully In cases with metastasis � death usually occurs within a year of detection of metastasis