PMC3726237_01
Upper left: Radiograph showing a lateral subluxation of the left hip joint. Upper right: Tomograph taken at admission showing a mineralized lesion adjacent to the joint surface of the joint. Lower: Computed tomography scan demonstrating the intraarticular lesion with erratically distributed mineralization. The lesion was 2x3 cm, and was located adjacent to the acetabulum.
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The lesion was 2x3 cm in size and located adjacent to the acetabulum (Figure 1).
Upper left, lower left: T1-weighted magnetic resonance image showing low-signal intensity in the lesion (white arrow head). The acetabulum adjacent to the lesion shows diffuse low signal intensity. Upper right, lower right: The lesion shows a high signal intensity on T2-weighted images (white arrow head). Joint effusion around the lesion is also observed. Signal changes in the acetabulum observed on T1-weighted images are not apparent on T2-weighted magnetic resonance images.
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T2-weighted images. The acetabulum adjacent to the lesion showed diffuse low signal intensity on T1-weighted MR images, but these signal changes were not observed on T2-weighted MR images (Figure 2).
Microphotograph of the lesion showing a proliferation of osteoblasts with an abundant formation of bony trabeculae. Nuclear atypia of these osteoblasts is mild, and no atypical mitosis is observed (Hematoxylin and eosin stain, original magnification, x400.
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Based on these findings, a final diagnosis of osteoblastoma was made (Figure 3).