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A magnetic resonance imaging (MRI) scan was performed to rule out a sternal fracture in a woman in 30s. Short tau inversion recovery (STIR) coronal showed no signal change in the sternum but increased signal from the mediastinum to the anterior thoracic region. We could not detect significant findings until midway through the examination. T 2 -weighted fat-suppressed images revealed a suspected left first costal cartilage injury at the end of the examination. In addition, three-dimensional gradient-recalled echo (3D GRE) T 1 -weighted fat-suppressed images clearly revealed a lesion area with a high signal intensity in the costal cartilage and a low signal intensity in the surrounding tissue, and we diagnosed costal cartilage injury definitely. In case of MRI for posttraumatic chest pain, T 1 -weighted fat-suppressed images with 3D GRE may be useful for the detection of lesion area.