MRI Manifestation and Early Diagnosis of Bone Infarct: A Rare Complication of Steroid Therapy for Pemphigus

The objective of the study was to analyse the magnetic resonance imaging (MRI) manifestation of bone infarction and explore the value of such imaging in early diagnosis. In bone infarction, aseptic osteonecrosis occurs in the metaphysis and diaphysis of long bones. The “Double line” sign in MRI is most characteristic of this lesion and is seen as high signal intensity in the inner zone along with lowsignal-intensity line in the outer zone in a T2 weighted image. In clinically suspected patients, MRI can be used for early diagnosis. Here we describe a case of pemphigus resulting from steroid therapy leading to development of bone infarction in the metadiaphyseal region of the femur and tibia.