Estimtes of Maternal age-specific Risks for Trisomy 18 in Presence of Isolated Choroid Plexus Cyst at Second-trimester Sonography (posterior probabilities)

Maternal Age
Maternal Age-Associated base Risk
Risk with Isolated

Choroid Plexus Cyst

95% Confidence Interval
20
1 / 4576
1 / 645
1 / 1154 - 1 / 376
21
1 / 4514
1 / 637
1 / 1138 - 1 / 371
22
1 / 4435
1 / 625
1 / 1119 - 1 / 364
23
1 / 4333
1 / 611
1 / 1093 - 1 / 356
24
1 / 4204
1 / 593
1 / 1060- 1 / 332
25
1 / 4045
1 / 570
1 / 1020 - 1 / 332
26
1 / 3850
1 / 543
1 / 971 - 1 / 316
27
1 / 3619
1 / 510
1 / 913 - 1 / 297
28
1 / 3351
1 / 473
1 / 845 - 1 / 275
29
1 / 3050
1 / 430
1 / 769 - 1 / 251
30
1 / 2724
1 / 384
1 / 687 - 1 / 224
31
1 / 2385
1 / 336
1 / 602 - 1 / 196
32
1 / 2046
1 / 289
1 / 516 - 1 / 168
33
1 / 1721
1 / 243
1 / 434 - 1 / 141
34
1 / 1420
1 / 200
1 / 358 - 1 / 117
35
1 / 1152
1 / 162
1 / 291 - 1 / 95
36
1 / 921
1 / 130
1 / 232 - 1 / 76
37
1 / 727
1 / 103
1 / 183 - 1 / 60
38
1 / 567
1 / 80
1 / 143 - 1 / 47
39
1 / 439
1 / 62
1 / 111 - 1 / 36
40
1 / 338
1 / 48
1 / 85 - 1 / 28
41
1 / 258
1 / 36
1 / 65 - 1 / 21
42
1 / 197
1 / 28
1 / 50 - 1 / 16
43
1 / 149
1 / 21
1 / 38 - 1 / 12
44
1 / 113
1 / 16
1 / 28 - 1 / 9
45
1 / 85
1 / 12
1 / 21 - 1 / 7

From: Ghidini A, Strobelt N, Locatelli A, Mariani E, Piccoli MG, Vergani P. Isolated fetal choroid plexus cysts: Role of ultrasonography in establishment of the risk of trisomy 18. Am J Obstet Gynecol 182:972-7, 2000. Copyright 2000 by Mosby Inc. with permission

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