Ovarian torsion in a prepubertal girl.

A previously healthy 4-year-old female presented to the Emergency Department complaining of sudden-onset right-lower-quadrant abdominal pain that awoke her from sleep. The pain was constant, non-radiating and severe. She denied trauma, dysuria, hematuria, nausea, vomiting, diarrhea, constipation or hematochezia. Her vitals were HR: 92, RR: 16, BP: 116/76 and T: 37.0 °C. Physical exam revealed tenderness at McBurney’s point, but no rebound, rigidity or guarding. CBC with differential, basic metabolic panel and urinalysis were all unremarkable. A CT abdomen with contrast and ultrasound revealed a 5.0 × 4.2 × 4.8-cm non-communicating cystic mass abutting the left dome of the bladder. The differential diagnosis included mesenteric cyst, enteric duplication cyst, urachal cyst and ovarian cyst. Surgical exploration confirmed the diagnosis of right ovarian cyst with torsion. Kokoska et al. reviewed 51 cases of ovarian torsion between 1983 and 1999 and reported the mean age to be 12.5 ± 1.3 years [1]. A similar study by Anders et al. reviewed 22 cases and calculated the mean age to be 10.2 years with a range of 3–15 years [2]. Ovarian torsion is a rare, but important cause of abdominal pain in younger children that requires a high index of suspicion (Figs. 1, 2 and 3).

Fig. 1

Transverse CT image

Fig. 2

Coronal CT image

Fig. 3

Abdominal US image