Ovarian torsion in a 12-year-old girl.

Background: A 12-year-old girl was admitted with acute abdominal pain, nausea and vomiting. She had been in excellent health until 2 years previsouly, when she had the first of several episodes of severe lower abdominal pain. Ultrasonography performed at that time did not show any abnormalities. Physical examination revealed a tender abdomen, mainly in the right lower quadrant, without fever. Psoas and obturator sign were slightly positive. Laboratory tests revealed a leukocyte count of 10,000/mm 3 with 92% neutrophils and 5% lymphocytes. CRP was within normal limits. The urine was positive for ketones and leucocytes.