INTRODUCTION
An open pelvic fracture refers to a fracture site exposed to the external environment. One specific type, which involves exposure through pelvic viscera such as the vagina, urethra, and rectum, constitutes only 2%-4% of pelvic fractures, yet it carries a mortality rate of 30%-50% [1]. Female perineal wounds are prone to being overlooked, leading to delayed treatment and severe infections. To enhance early detection and effective management, careful observation of the ’free black air bubble sign’ and ’fracture blade sign’ on pelvic CT, along with a thorough examination of the labia wound in the female perineum and colposcopy is essential.
We present a case of inconspicuous open pelvic fracture accompanied by a small wound in the nympholabial furrow. A 37-year-old woman experienced multiple fractures and soft tissue injuries in a car accident, with the left hip absorbing the primary impact and sustaining the most severe injury. The open wound in the perineal area went unnoticed initially due to the absence of apparent symptoms and the unique anatomical structure.