Value of Transvaginal Two-Dimensional Contrast-Enhanced Ultrasonography in Diagnosing Atypical Ovarian Corpus Luteum Hematoma

Table 4

Comparing 2D-CEUS perfusion patterns in AT-OCLH and nonluteal solid masses.

Group	Cases (N)	Classification of perfusion pattern
		Type I	Type II	Type III	Type IV
AT-OCLH	23	4	18	1	0
Non-luteal solid masse	17	0	0	11	6
U value			5.500
P			<0.001

Note. Mann–Whitney U test, P < 0.05.