Isolated fallopian tubal torsion: A challenging ultrasound diagnosis

Whilst pelvic pain in the young female is a common presentation, isolated fallopian tube torsion (IFTT) is a rare cause that is often diagnosed at surgery. We present a case of a 29‐year‐old woman with IFTT and a past history of ruptured appendicitis. The pathogenesis of this condition is thought to be due to a venous or lymphatic obstruction. The sonographic “whirlpool sign” has been described as pathognomonic for this condition; however, it can be difficult to visualise when comparedwith that of adnexal torsion. The lack of specific clinical signs, biochemical markers, and imaging findings associated with IFTT often necessitates diagnostic laparoscopic surgery to make the correct diagnosis. Sonographic features of this condition include: a normal‐ appearing uterus and ovaries, a dilated fallopian tube with an oedematous wall, and an elongated cystic mass with variable endoluminal linear projections.