<prompt> Loosers zones are seen in:OsteoporosisOsteomalaciaOsteosarcomaTB spine  <response>: Ans b OsteomalaciaRef : Maheshwari 5th ed. 312 Cortical infarctions are wide transverse lucencies traversing bone usually at right angles to the involved cortex and are associated most frequently with osteomalacia and rickets . They are pseudo- fractures and considered a type of insufficiency fracture. Typically, the fractures have sclerotic irregular margins, and are often symmetrical.Causes Osteomalacia Renal osteodystrophy Fibrous dysplasia Hyperthyroidism Pagets disease of bone X linked hypophosphataemia Osteogenesis Imperfecta 