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Table 2 Optical coherence tomography (OCT) features noted in different clinical stages of type 2 MacTel identified on retinal examination

From: Spectral domain OCT features in type 2 macular telangiectasia (type 2 MacTel): its relevance with clinical staging and visual acuity

Classification

Gass and Blodi [2]

Yannuzzi et al. [3]

Clinical stages

Loss of retinal transparency and presence of perifoveal greying (Stage 1) (N = 31)

No or occult visible telangiectasias (Stage 2) (N = 35)

Dilated right angled venules (Stage 3) (N = 73)

Retinal pigment plaques (Stage 4) (N = 38)

Presence of SRNVM or proliferative disease (Stage 5) (N = 35)

Non-proliferative stage (N = 175)

Proliferative stage (N = 37)

SDOCT features

 Irregularity of foveal contour (N, %)

2 (6)

4 (11)

12 (16)

22 (58)

26 (74)

39 (22)

27 (73)

 ILM drape (N, %)

12 (39)

17 (49)

27 (37)

2 (5)

4 (11)

57 (33)

5 (14)

 Hyperreflective middle retinal layers (N, %)

30 (97)

34 (97)

69 (95)

35 (92)

16 (46)

166 (95)

18 (49)

 Superficial hyperreflective retinal dots (N, %)

0 (0)

0 (0)

1 (1)

3 (8)

2 (6)

4 (2)

2 (5)

 Hypo reflective inner retinal cavities (N, %)

16 (52)

26 (74)

39 (53)

13 (34)

10 (29)

93 (53)

11 (30)

 Outward bending of inner retinal layers (N, %)

7 (23)

0 (0)

29 (40)

20 (53)

8 (23)

66 (38)

8 (22)

 Hypo reflective outer retinal cavities (N, %)

7 (23)

9 (26)

13 (18)

3 (8)

0 (0)

32 (18)

0 (0)

 Hyperreflective retinal pigment clumps (N, %)

1 (3)

3 (9)

11 (15)

37 (97)

22 (63)

52 (30)

22 (59)

 Subfoveal SRF (N, %)

2 (6)

3 (9)

18 (25)

2 (5)

9 (26)

24 (14)

10 (27)

 SRNVM (N, %)

1 (3)

2 (6)

10 (14)

3 (8)

25 (71)

15 (9)

25 (70)

 RCA (N, %)

1 (3)

1 (3)

2 (3)

5 (13)

10 (29)

10 (6)

10 (27)

  1. ILM, internal limiting membrane; SRNVM, subretinal neovascular membrane; RCA, retino-choroidal anastomosis; SRF, subretinal fluid