In the worst cases, the placenta can penetrate through the myometrium
to the uterine serosa and may invade adjacent organs.
The architectural organisation of the inner myometrium
is unique with a concentric arrangement of smooth-muscle fibres in contrast to the longitudinal orientation of the smooth-muscle fibres of the outer myometrium
Sagittal and axial T1- and T2-weighted images demonstrated a gestational sac bulging through the myometrium
of the lower uterine segment in the region of Cesarean section scar (Figure 4).
In vitro activity of human chorionic gonadotropin (hCG) on myometrium
Abnormal vasculature adjacent to the uterus on imaging may represent penetration of the placenta through the uterus or mere recruitment and enlargement of separate vessels beyond to enhance blood supply to the myometrium
These gestational sacs will be completely surrounded by uterine myometrium
, although focal thinning is seen at times.
is expected to be thicker at all sides of the sac in an angular pregnancy; however, myometrium
less than 5 mm surrounds the interstitial gestational sac.
An absence of healthy myometrium
between the bladder and gestational sac.
Features supporting uterine origin include splaying of myometrium
around the lesion (the claw sign) and a bridge of feeding vessels arising from the myometrium
, seen between the lesion and myometrium
(the bridging vessel sign or bridging vascular sign) (Fig.
The patient was admitted with lower abdominal pain and tenesmus, and ultrasonographic examination revealed a 10x10 cm uniloculated mass with regular borders in the myometrium
Myomectomy is performed within the confines of the uterus and myometrium
, with only infrequent occasion to operate near the ureters, uterine vessels, bowel, or bladder.
Gross examination of the specimen revealed well developed uterus and cervix with unremarkable endometrium and myometrium
Figure-2 and 3) Placenta accreta was difficult to visualize on CT due to poor sensitivity and resolution of CT for the myometrium
Uterine leiomyoma is the most common benign tumor originating from uterine smooth muscle cells of the myometrium
3) Uterine leiomyomas can be hypoechoic to normal myometrium