Figure 1.
An 87-year-old man with a phosphaturic mesenchymal tumor in the ethmoid sinus (case 9). a) Radiograph of the right knee demonstrates coarse trabecular bone involving distal femur, proximal tibia, and proximal fibula with the presence of pseudofractures.b)  Radiograph of the left humerus demonstrates pseudofractures.c) A lumbar spine radiograph reveals diffuse osteopenia with variable decreases in vertebral body heights. d)99mTc bone scintigraphy reveals increased tracer uptake in multiple ribs, vertebral bodies, the left humerus, the right distal femur, the right proximal tibia, and the left distal tibia, indicating multiple pseudofractures. e) Coronal brain MRI reveals a lobulated mass (white arrow) in the ethmoid sinus with extension to the skull base.