Case reportA 29 year old healthy woman underwent a routine ultrasound scan during the 11th week of her first pregnancy. A fibroid was noted arising from the cervical region. At the 20 weeks scan it measured 12 Â 17 Â 10 cm and areas of degeneration were observed within it. She was delivered by elective caesarean section at 39 weeks because of obstruction due to the fibroid. The fibroid arose from the posterior aspect of the cervix and displaced the uterus to the right and anteriorly. Safe delivery of the baby and haemostasis afterwards were achieved with difficulty. The estimated blood loss was 5000 mL and nine units of blood were transfused.She made a good recovery and was discharged on the 10th post-operative day. At that time her haemoglobin level was 10.5 g/dL and the caesarean wound had healed with no signs of infection or inflammation.When the patient was followed up postpartum, it was noticed that the fibroid mass had increased greatly in size and 10 weeks after the caesarean section she was referred to the Oxford Gynaeoncology Centre. At that time the tumour was approximately equivalent in size to a 36 week gravid uterus and was tender on palpation. The caesarean scar was inflamed and tender and had opened in several places with a puslike discharge. The patient complained of constant abdominal pain, requiring morphine for pain relief. Although she had been taking iron tablets and had experienced no vaginal bleeding since the caesarean section, her haemoglobin level had fallen to 8.2 g/dL.All the tumour markers, a-fetoprotein, h-human chorionic gonadotrophin (hhCG), CA125 and carcinoembryonic antigen, were negative. A computerised tomography scan of her chest showed clear fields with no significant mediastinal or hilar lymphadenopathy.Magnetic resonance imaging of her abdomen and pelvis showed a large mass arising out of the pelvis (Fig. 1). This mass was extremely heterogeneous with cystic components having fluid/air levels but with the majority of the lesion appearing more solid. There were multiple areas of haemorrhage and calcification within the solid component. The liver and spleen appeared normal. There were no ascites.Taking into account the rapid growth of the tumour and the bizarre magnetic resonance imaging findings, there was considerable concern that the tumour was most likely an infiltrating sarcoma coming through the anterior abdominal wall. The case was discussed at a multidisciplinary team meeting and a decision was made to perform exploratory laparotomy with an attempt to remove the tumour.On laparotomy, a mass, the size of a 36 week pregnant uterus, was found arising from the posterior cervix and displacing the uterus anteriorly and to the right. The pelvic anatomy was distorted and the left adnexa impossible to identify. The right ovary and fallopian tube appeared normal. Dilatation of the left ureter was noted. The tumour was well defined with no obvious spread into adjacent organs or abdominal wall. No bowel, omental or liver deposits were detected.The operation was technically diffi...