case_images: PMC5632487_01
case_images: Anterior-posterior radiograph of the hip. Enlargement of the acetabular fossa is shown (black arrow).
case_images: CRIOR2017-9806863.001.jpg
case_images: PMC5632487_01_CRIOR2017-9806863.001.jpg
case_images: fig1
case_images: An anteroposterior plain radiograph of the hip indicated enlargement of the acetabular fossa of the affected hip (Figure 1).
case_images: T1-weighted axial magnetic resonance image of the left hip joint. The extra-articular herniation sac is indicated by the arrowhead.
case_images: CRIOR2017-9806863.002.jpg
case_images: PMC5632487_01_CRIOR2017-9806863.002.jpg
case_images: fig2
case_images: A large extra-articular tumour-like lesion appeared to be connected to the inferomedial joint capsule (Figure 2).
case_images: Arthro-computerised tomography scan of the left hip joint. The extra-articular herniation sac is indicated by the arrowhead.
case_images: CRIOR2017-9806863.003.jpg
case_images: PMC5632487_01_CRIOR2017-9806863.003.jpg
case_images: fig3
case_images: Arthrography and computed tomography (CT) images of the left hip joint also revealed a honeycomb appearance of the lesion (Figure 3).
case_images: Histological section with haematoxylin and eosin staining. Clustered chondrocytes were observed in hyaline cartilage tissue (arrow).
case_images: CRIOR2017-9806863.004.jpg
case_images: PMC5632487_01_CRIOR2017-9806863.004.jpg
case_images: fig4
case_images: Histopathological examination confirmed the diagnosis of a synovial osteochondromatosis (Figure 4).
case_images: Excised osteochondromas.
case_images: CRIOR2017-9806863.005.jpg
case_images: PMC5632487_01_CRIOR2017-9806863.005.jpg
case_images: fig5
case_images: Osteochondromas in the herniation sac were easily and completely removed manually (Figure 5).
case_images: T1-weighted coronal magnetic resonance image at 1 month after surgery. There was no sign of avascular necrosis of the femoral head. The herniation sac had diminished in size (arrow).
case_images: CRIOR2017-9806863.006.jpg
case_images: PMC5632487_01_CRIOR2017-9806863.006.jpg
case_images: fig6
case_images: The herniation sac diminished in size, with no apparent contents (Figure 6).
case_images: PMC5632487_02
case_images: Arthrography of the hip. There are many loose bodies in the left hip joint (honeycomb appearance: arrow).
case_images: CRIOR2017-9806863.007.jpg
case_images: PMC5632487_02_CRIOR2017-9806863.007.jpg
case_images: fig7
case_images: Arthrography showed a honeycomb appearance around her left hip joint (Figure 7).
case_images: T1-weighted axial image of extra-articular loose bodies (arrow) adjacent to the iliopsoas muscle and the femoral vessels (asterisk).
case_images: CRIOR2017-9806863.008.jpg
case_images: PMC5632487_02_CRIOR2017-9806863.008.jpg
case_images: fig8
case_images: Upon MR imaging, axial images of the left hip joint revealed intra-articular and extra-articular mass lesions, one of which was located adjacent to the femoral vessels (Figure 8).
case_images: Excised osteochondromas of case 2.
case_images: CRIOR2017-9806863.009.jpg
case_images: PMC5632487_02_CRIOR2017-9806863.009.jpg
case_images: fig9
case_images: Osteochondromas existing in the iliopsoas muscle were completely excised by bluntly splitting the muscle and herniation sac (Figure 9).