me myself had gone through one of it. my fibroid was as big as a baby. 25cm. huge! the doc was extremely mad at me because i didnt notice it earlier. i told them its not there until at one time i felt hardening in my tummy. luckily, mine was just above the uterus.
my operation was successed and the location was same like ceaserean. 3 months after the operation, i got pregnant and again the doc mad at me because its too soon. and i cant give normal birth. again i cut my tummy for the second time.
for your situation,ur wife really need to go for another check up to see wether the fibroid is getting bigger or not and if its really in the uterus or just outside the uterus, just to make sure. and your wife need to watch what she eats. there is some foods that can promote the growth of the fibroid. better avoid.
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