Table 2. Lesions simulating retinoblastoma (pseudoretinoblastoma) in 604 patients based on age at presentation.

Pseudoretinoblastoma diagnosis	Patient age Number (% per diagnosis) [% per age group]
	Mean, median [range] in years	0–1 year n=283	>1–2 years n=57	>2–5 years n=89	>5 years n=175	All ages n=604
Coats disease	6, 4 [0.2–30]	58 (24) [20]	33 (14) [59]	54 (22) [50]	99 (41) [58]	244 (100) [40]
Persistent fetal vasculature (PFV)	2, 1 [0.2–24]	138 (87) [49]	6 (4) [11]	6 (4) [7]	8 (5) [5]	158 (100) [26]
Vitreous haemorrhage	1, 1 [0.5–8]	21 (78) [7]	3 (11) [5]	1 (4) [1]	2 (7) [1]	27 (100) [5]
Toxocariasis	8, 8 [1–18]	1 (5) [<1]	0 (0) [0]	7 (32) [8]	14 (64) [8]	22 (100) [4]
Familial exudative vitreoretinopathy (FEVR)	7, 7 [0.6–16]	5 (28) [2]	1 (6) [2]	1 (6) [1]	11 (61) [6]	18 (100) [3]
Rhegmatogenous retinal detachment	5, 1 [0.5–24]	10 (56) [4]	0 (0) [0]	3 (17) [3]	5 (28) [3]	18 (100) [3]
Coloboma	3, 1 [0.3–11]	9 (53) [3]	1 (6) [2]	3 (18) [3]	4 (24) [2]	17 (100) [3]
Astrocytic hamartoma	8, 6 [0.5–28]	3 (20) [1]	1 (7) [2]	3 (20) [3]	8 (53) [5]	15 (100) [2]
Combined hamartoma	4, 2 [0.5–16]	4 (27) [1]	5 (33) [9]	1 (7) [1]	5 (33) [3]	15 (100) [2]
Endogenous endophthalmitis	5, 5 [0.2–11]	2 (20) [<1]	0 (0) [0]	2 (20) [2]	6 (60) [3]	10 (100) [2]
Myelinated nerve fibres	4, 4 [0.5–11]	3 (33) [1]	0 (0) [0]	2 (22) [2]	4 (44) [2]	9 (100) [1]
Congenital cataract	3, 1 [0.2–12]	5 (63) [2]	1 (13) [2]	0 (0) [0]	2 (25) [1]	8 (100) [1]
Peripheral uveoretinitis	3, 2 [0.5–6]	3 (43) [1]	1 (14) [2]	0 (0) [0]	3 (43) [2]	7 (100) [1]
Retinopathy of prematurity	2, 2 [0.8–7]	3 (43) [1]	2 (29) [4]	1 (14) [1]	1 (14) [<1]	7 (100) [1]
Non-rhegmatogenous retinal detachment	1, 1 [0.6–4]	4 (80) [1]	0 (0) [0]	1 (20) [1]	0 (0) [0]	5 (100) [<1]
Medulloepithelioma	4, 4 [2–5]	0 (0) [0]	1 (25) [2]	3 (75) [3]	0 (0) [0]	4 (100) [<1]
X-linked retinoschisis	2, 1 [0.6–7]	3 (75) [1]	0 (0) [0]	0 (0) [0]	1 (25) [<1]	4 (100) [<1]
Vitreoretinal tuft	3, 1 [0.6–8]	2 (67) [<1]	0 (0) [0]	0 (0) [0]	1 (33) [<1]	3 (100) [<1]
Incontinentia pigmenti	4, 4 [2–6]	0 (0) [0]	1 (50) [2]	0 (0) [0]	1 (50) [<1]	2 (100) [<1]
Juvenile xanthogranuloma	1, 1 [0.7–0.8]	2 (100) [<1]	0 (0) [0]	0 (0) [0]	0 (0) [0]	2 (100) [<1]
Norrie's disease	1, 1 [0.7–0.8]	2 (100) [<1]	0 (0) [0]	0 (0) [0]	0 (0) [0]	2 (100) [<1]
Vasoproliferative tumour	10, 10 [3–17]	2 (100) [<1]	0 (0) [0]	0 (0) [0]	0 (0) [0]	2 (100) [<1]
Choroidal osteoma	3	0 (0) [0]	0 (0) [0]	1 (100) [1]	0 (0) [0]	1 (100) [<1]
Morning glory disc anomaly	1	1 (100) [<1]	0 (0) [0]	0 (0) [0]	0 (0) [0]	1 (100) [<1]
Retinal capillary hemangioma	16	1 (100) [<1]	0 (0) [0]	0 (0) [0]	0 (0) [0]	1 (100) [<1]
Retrolental fibrosis	2	0 (0) [0]	1 (100) [2]	0 (0) [0]	0 (0) [0]	1 (100) [<1]
Toxoplasmosis	1	1 (100) [<1]	0 (0) [0]	0 (0) [0]	0 (0) [0]	1 (100) [<1]