Diagnosis of urinary conditions

For each description below, choose the single most appropriate answer from the above list of options. Each option may be used once, more than once, or not at all.

1 A 36-year-old Afro-Caribbean lady presents with a pregnancy at 12 weeks’ gestation with severe abdominal pain and not having voided for the past 10 hours. On examination the uterus is retroverted. What is the most likely diagnosis?