Table 2.
Natural evolution of scolex and cyst characteristics on various MRI sequences during 3 years follow-up.1
| Baseline |
6 Months |
1 Year |
2 Years |
3 Years |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Typical N = 42 | Atypical N = 17 | Typical N = 32 | Atypical N = 13 | Typical N = 20 | Atypical N = 12 | Typical N = 9 | Atypical N = 7 | Typical N = 6 | Atypical N = 6 | |||
| Scolex | T2 | S | 17 (40.5) | 9 (52.9) | 8 (25) | 3 (23.1) | 4 (20) | 0 (0) | 2 (22.2) | 0(0) | 1(16.7) | 0(0) |
| NS | 25 (59.5) | 8 (47.1) | 19 (59.4) | 8 (61.5) | 11 (55) | 11 (91.7) | 7 (77.8) | 7(100) | 5 (83.3) | 6 (100) | ||
| T2-FLAIR | S | 11 (29.2) | 6 (35.3) | 6 (18.8) | 1 (7.7) | 3 (15) | 0 (0) | 1 (11.1) | 0 (0) | 1 (16.7) | 0 (0) | |
| NS | 31 (70.8) | 11 (64.7) | 18 (56.2) | 11 (84.6) | 11 (55) | 8 (66.7) | 7 (77.8) | 7 (100) | 5 (83.3) | 6 (100) | ||
| Routine | S | 19 (45.2) | 10 (58.8) | 7 (21.9) | 3 (23.1) | 4 (20) | 0 (0) | 2 (22.2) | 0 (0) | 1 (16.7) | 0 (0) | |
| NS | 23 (54.8) | 7 (41.2) | 20 (62.5) | 10 (76.9) | 11 (55) | 11 (91.7) | 7 (77.8) | 7 (100) | 5 (83.3) | 6 (100) | ||
| T1 SPGR (NC) | S | 14 (33.3) | 9 (52.9) | 6 (18.8) | 2 (15.4) | 4 (20) | 0 (0) | 2 (22.2) | 0 (0) | 1 (16.7) | 0 (0) | |
| NS | 28 (66.7) | 8 (47.1) | 17 (53.1) | 10 (76.9) | 8 (50) | 7 (58.3) | 3 (33.3) | 7 (100) | 3 (50) | 6 (100) | ||
| T1 SPGR (contrast) | S | 13 (30.9) | 7 (41.2) | 4 (12.5) | 1 (7.7) | 2 (10) | 0 (0) | 2 (22.2) | 1 (14.3) | 1 (16.7) | 0 (0) | |
| NS | 29 (69.1) | 10 (58.8) | 22 (68.8) | 11 (84.6) | 12 (60) | 7 (58.3) | 4 (44.4) | 6 (85.7) | 5 (83.3) | 6 (100) | ||
| SWAN | S | 30 (71.4) | 15 (88.2) | 11 (34.4) | 4 (30.8) | 4 (20) | 0 (0) | 2 (22.2) | 0 (0) | 1 (16.7) | 0 (0) | |
| NS | 12 (28.6) | 2 (11.8) | 16 (50.0) | 8 (25.0) | 9 (45) | 9 (75) | 7 (77.8) | 7 (100) | 5 (83.3) | 6 (100) | ||
| FIESTA | S | 32 (76.2) | 16 (94.1) | 7 (21.9) | 5 (38.5) | 5 (25) | 0 (0) | 3 (33.3) | 0 (0) | 1 (16.7) | 0 (0) | |
| NS | 10 (23.8) | 1 (05.9) | 13 (40.6) | 7 (21.9) | 8 (40) | 6 (50) | 5 (55.5) | 7 (100) | 4 (66.7) | 6 (100) | ||
| Advanced | S | 35 (83.3) | 16 (94.1) | 10 (31.2) | 5 (38.5) | 5 (25) | 0 (0) | 3 (33.3) | 0 (0) | 1 (16.7) | 0 (0) | |
| NS | 7 (16.7) | 1 (05.9) | 19 (59.3) | 9 (69.2) | 14 (70) | 7 (58.3) | 6 (66.6) | 7 (100) | 5 (83.3) | 6 (100) | ||
| Scolex character | T2 | Ho/Iso | 17 (100) | 8 (88.9) | 8 (100) | 3 (100) | 4 (100) | NA | 2 (100) | NA | 1 (100) | NA |
| Hyr | 0 (0) | 1 (11.1) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | |||||
| T2-FLAIR | Ho/Iso | 9 (81.8) | 6 (100) | 6 (100) | 1 (100) | 3 (100) | NA | 1 (100) | NA | 1 (100) | NA | |
| Hyr | 2 (18.2) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | |||||
| T1 SPGR (NC) | Ho/Iso | 2 (14.3) | 3 (33.3) | 2 (33.3) | 2 (100) | 1 (25) | NA | 0 (0) | NA | 0 (0) | NA | |
| Hyr | 12 (85.7) | 6 (66.7) | 4 (66.7) | 0 (0) | 3 (75) | 2 (100) | 1 (100) | |||||
| T1 SPGR (contrast) | Ho/Iso | 4 (30.8) | 1 (14.3) | 1 (25) | 0 (0) | 0 (0) | NA | 0 (0) | 1 (100) | 0 (0) | NA | |
| Hyr | 9 (69.2) | 6 (85.7) | 3 (75) | 1 (100) | 2 (100) | 2 (100) | 0 | 1 (100) | ||||
| SWANa | Ho/Iso | 30 (100) | 15 (100) | 11 (100) | 4 (100) | 4 (100) | NA | 2 (100) | NA | 1 (100) | NA | |
| FIESTAa | Ho/Iso | 32 (100) | 16 (100) | 7 (100) | 5 (100) | 5 (100) | NA | 3 (100) | NA | 1 (100) | NA | |
| Cyst content | T2 | Ho | 0 (0) | 0 (0) | 2 (9.5) | 0 (0) | 1 (10) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
| Iso | 6 (14.3) | 1 (5.9) | 1 (4.8) | 2 (18.2) | 5 (50) | 1 (16.7) | 2 (40) | 1 (20) | 3 (75) | 0 (0) | ||
| Hyr | 36 (85.7) | 16 (94.1) | 18 (85.7) | 9 (81.8) | 4 (40) | 5 (83.3) | 3 (60) | 4 (80) | 1 (25) | 2 (100) | ||
| T2-FLAIRa | Ho | 31 (73.8) | 14 (82.4) | 14 (66.7) | 10 (83.3) | 4 (36.4) | 6 (85.7) | 4 (80) | 6 | 3 (75) | 3 (100) | |
| Iso | 11 (26.2) | 3 (17.6) | 7 (33.3) | 2 (16.7) | 7 (63.6) | 1 (14.3) | 1 (20) | 0 (0) | 1 (25) | 0 (0) | ||
| T1 SPGRa (NC) | Ho | 42 (100) | 17 (100) | 20 (90.9) | 11 (91.7) | 11 (100) | 6 (100) | 3 (100) | 4 (100) | 4 (100) | 3 (100) | |
| Iso | 0 (0) | 0 (0) | 2 (9.1) | 1 (8.3) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | ||
| T1 SPGRa (contrast) | Ho | 42 (100) | 17 (100) | 25 (100) | 11 (100) | 11 (100) | 0 (0) | 6 (100) | 6 (100) | 5 (100) | 3 (100) | |
| Iso | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 9 (100) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | ||
| SWAN | Ho | 0 (0) | 2 (11.8) | 0 (0) | 0 (0) | 1 (11.1) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | |
| Iso | 39 (92.9) | 14 (82.3) | 23 (100) | 10 (90.9) | 8 (88.9) | 1 (100) | 5 (100) | 2 (40) | 4 (100) | 3 (75) | ||
| Hyr | 3 (7.1) | 1 (5.9) | 0 (0) | 1 (9.1) | 0 (0) | 0 (0) | 0 (0) | 3 (60) | 0 (0) | 1 (25) | ||
| FIESTAa | Iso | 2 (4.8) | 0 (0) | 3 (15) | 3 (25) | 7 (58.3) | 5 (83.3) | 3 (60) | 6 (100) | 3 (75) | 0 (0) | |
| Hyr | 40 (95.2) | 17 (100) | 17 (85) | 9 (75) | 5 (41.7) | 1 (16.7) | 2 (40) | 0 (0) | 1 (25) | 4 (100) | ||
| Cyst wall | T2 | Ho | 26 (61.9) | 9 (52.9) | 16 (59.3) | 0 (0) | 11 (84.6) | 11 (100) | 9 (100) | 6 (85.7) | 6 (100) | 5 (100) |
| Iso | 16 (38.1) | 8 (47.1) | 11 (40.7) | 4 (36.4) | 2 (15.4) | 0 (0) | 0 (0) | 1 (14.3) | 0 (0) | 0 (0) | ||
| Hyr | 0 (0) | 0 (0) | 0 (0) | 7 (63.6) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | ||
| T2-FLAIRa | Ho | 7 (16.7) | 3 (17.6) | 16 (66.7) | 4 (33.3) | 12 (92.3) | 11 (100) | 7 (87.5) | 5 (71.4) | 6 (100) | 6 (100) | |
| Iso | 35 (83.3) | 14 (82.4) | 8 (33.3) | 8 (66.7) | 1 (7.7) | 0 (0) | 1 (12.5) | 2 (28.6) | 0 (0) | 0 (0) | ||
| T1 SPGRa (NC) | Ho | 0 (0) | 0 (0) | 1 (4.3) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 3 (60) | |
| Iso | 42 (100) | 17 (100) | 22 (95.7) | 12 (100) | 12 (100) | 10 (100) | 3 (100) | 6 (100) | 4 (100) | 2 (40) | ||
| T1 SPGRa (contrast) | Hyr | 42 (100) | 17 (100) | 26 (100) | 12 (100) | 13 (100) | 12 (100) | 8 (100) | 7 (100) | 6 (100) | 6 (100) | |
| SWANa | Ho | 29 (69.1) | 17 (100) | 13 (48.1) | 8 (66.7) | 10 (71.4) | 8 (88.9) | 9 (100) | 3 (42.9) | 6 (100) | 5 (83.3) | |
| Iso | 13 (30.9) | 0 (0) | 14 (51.9) | 4 (33.3) | 4 (28.6) | 1 (11.1) | 0 (0) | 4 (57.1) | 0 (0) | 1 (16.7) | ||
| FIESTAa | Ho | 16 (38.1) | 0 (0) | 20 (100) | 10 (83.3) | 12 (92.3) | 7 (87.5) | 8 (100) | 7 (100) | 5 (100) | 6 (100) | |
| Iso | 26 (61.9) | 17 (100) | 0 (0) | 2 (16.7) | 1 (7.7) | 1 (12.5) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | ||
1
A data of sequences with zero values have not been shown in table. Values in parenthesis () are in percentages. Characteristics of non-visualised cyst cavities have not been included. FIESTA: Fast imaging employing steady-state acquisition, FLAIR: Fluid attenuated inversion recovery, Ho: Hypointense, Hyr: Hyperintense, Iso: Isointense, NA: Not applicable, NC: Non-contrast, NS: Not seen, S: Seen, SPGR: Spoiled gradient recalled echo, SWAN: T2 star-weighted angiography.