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. 2006 Jul 18;3:6. doi: 10.1186/1742-4755-3-6

Table 1.

Frequency of prenatal ultrasound MMC diagnosis according to the detection time and the level of lesion.

Level of MMC	Diagnosed			Undiagnosed	Total

	1^sttrimester n (%)	2^ndtrimester n (%)	3^rdtrimester n (%)	n (%)	n (%)
Cervical/Cervicothoracic	0 (0)	0 (0)	0 (0)	5 (100)	5 (100)
Thoracic/Thoracolumbar	2 (6.6)	2 (6.6)	8 (26.8)	18 (60)	30 (100)
Lumbar/Lumbosacral/Sacral	0 (0)	8 (8)	13 (13)	79 (79)	100 (100)

Total	2 (1.4)	10 (7.4)	21 (15.5)	102 (75.5)	135*(100)

* One patient was omitted due to double MMC sacs in cervical and sacral regions that could not be placed in this categorization.