Background:   Splenic rupture is a potentially life-threatening condition, often associated with chest or abdominal trauma. Spontaneous rupture is very rare and is usually reported as being secondary to underlying pathological conditions.
Case Report:  We discuss the case of a 56 year old man who presented with sudden onset left-sided abdominal pain, with no history of trauma.
Conclusions:   A computed tomography (CT) of the abdomen revealed a ruptured spleen with free fluid in the abdomen. Conservative management was ineffective and the patient underwent laparotomy and splenectomy, followed by routine post-splenectomy management. He was discharged home and remains well.

Keywords: atraumatic, unknown aetiology, splenic rupture