Published online by Cambridge University Press: 10 October 2020
Intramural myomas, the most common type of uterine leiomyoma, develop within the uterine wall and expand either inwards or outwards. According to the FIGO [1] leiomyoma classification system, fibroid types range from 0 to 8. Types 0, 1 and 2 are submucosal myomas, and subserosal myomas refer to type 5 to 7. Both type 3 and type 4 myomas are known as intramural myomas with no involvement of the endometrial cavity (Figure 13.1). The type 3 myomas, which are in the uterine wall but in contact with the endometrium, are more likely to distort the cavity under certain stimulations. Type 4 myomas stay entirely within the myometrium, which does not expand to either the endometrium or the serosa.
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