Bladder flap haematoma is a haematoma between the uterus and posterior wall of bladder. They may be small (more commonly) or large (>5 cm, less common).
Small haematomas may be asymptomatic. Large ones may present with lower abdominal pain, dysuria, anaemia and fever (if infected).
It is an uncommon complication of caesarean section, due to bleeding and uterine dehiscence, usually at transverse lower uterine incision. It has also been reported with longitudinal incisions.
It is seen as heterogeneous solid lesion with variable amount of fluid component. Presence of gas foci strongly suggests infected haematoma or an abscess. It is less useful in demonstrating the dehiscence.
May show slightly hyperattenuating fluid density in between posterior wall of bladder and uterus, however, MRI is preferred over CT.
It has the ability to distinguish the blood products (see: ageing blood on MRI) and abscess. Sagittal and axial images have been very useful in demonstrating transverse lower uterine and longitudinal incisional dehiscence respectively.
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