[Spontaneous fracture of the sacrum in patient with pulmonary fibrosis and steroid treatment].

A 54 year old, postmenopause female with pulmonary fibrosis on steroid therapy is studied for lumbar and sacral pain. An insufficiency fracture of the sacrum is found. Bone scintigraphy and CT scan of the area made the diagnosis. Clinical and laboratory findings are submitted together with a literature review.