Women 21
yo, single, acute  hypogastric pain, polykiuria, normal urine analysis. 
Ultrasound
 scanning
 in pelvis  shows
uterus  normal in
size with endometrium thickening, fluid collecting arround  uterus looked like  blood (US 1)
 
and  on right  site of uterus exists  one  round mass, size  of 5 cm
 with multiple cystic (US 2), 
US 3 =  Color Doppler of  this mass is  normal vascularization, 
US 4 = PW Doppler
of  right uterine artery  with RI =0.82.
Sonologist
 alerts  bleeding  intrapelvis and  suspected  rupture of right ovary cyst.
MSCT with
CE : Non intrauterus pregnancy (
CT1), and this mass  at right parameter  is  cystic in  central part and  thickening wall  with  blood arrounding.  
 
Radiologist
 diagnosis  is  hemoperitoneum due to rupture of luteinic corpus  of  right ovary;  blood collecting volume  arround
100ml.
Blood test
 makes sure negative beta HCG.
Clinical
finding  is acute pelvis pain in single female  patient, ultrasound
 quickly detected  bleeding
 intra pelvis  and blood test ruling out a case of ectopic pregnancy.
Ultrasound is  best
diagnosis and follow up this case,  no need  CT.
This patient was admitted  OBGY hospital for survey in  3 days and discharged later.
Conclusion:
  In female patient,  of acute  pelvis pain case,  ultrasound  is first
choice of imaging modalities  for diagnosis about
 luteinic corpus   rupture in bleeding, and  beta HCG to  confirm diagnosis of  MITTELSCHMERZT
 SYNDROME.