Ruptured salpingitis isthmica nodosa: a rare cause for spontaneous haemoperitoneum.

Salpingitis isthmica nodosa (SIN) is the nodular swelling or diverticulum of the isthmus of the fallopian tube. It is most commonly identified when investigating female infertility or in association with ruptured ectopic pregnancies. We experienced a rare and atypical presentation of SIN.