Pyogenic sacroiliitis is a rare condition with often vague symptoms mimicking common conditions such as protruded disk, muscular strain, or visceral pain. Therefore the diagnosis is often missed or delayed. In 1986, Cohn and Schoetz reviewed patients with pyogenic sacroiliitis.¹ In 12.6% of these cases sacroiliitis mimicked the acute abdomen. In 40–60% fever and a raised erythrocyte sedimentation rate were present. Blood cultures were positive in 60%. Magnetic resonance imaging and computer tomography can be helpful, but especially when blood cultures are negative, joint aspiration can be crucial for establishing the diagnosis. We present two cases of infectious sacroiliitis.

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