Preoperative staging of osteosarcoma: efficacy of MR imaging in detecting joint involvement.

Infiltration of sarcomas into the hip joint: Comparison of CT, MRI and histologic findings in 67 cases

“…Radiological examination with CT or MR imaging showed joint invasion in 22-32% of bone sarcomas (Bloem et al 1988, Schurawitzki et al 1989, Seeger et al 1991, Schima et al 1994). In our study, rates for hip joint in ltration varied with the diagnosis; almost half of the CSs, one tenth of the OSs, but none of the 12 ESs showed histological evidence of an intraarticular tumor.…”

“…As the space between the acetabulum and the femoral head is minimal, the presence of a tumor mass between the 2 surfaces may be dif cult to detect. In the hip joint, radiological detection of a sarcoma inside the ligamentum teres may be dif cult; this differs from the cruciate ligament of the knee joint (Schima et al 1994). Some cases were radiologically very likely cases of an intraarticular tumor; however, they were histologically negative (Figure 3).…”

“…n In ltration of bone sarcomas into joints occurs in 3 ways, namely: 1) penetration through the joint cartilage, 2) extension around the articular cartilage beneath the joint capsule, and 3) via intraarticular structures, such as through an osseous-tendinous junction of an intraarticular ligament (Simon and Hecht 1982, Sato et al 1993, Schima et al 1994. However, transarticular spread of tumor cells to the opposite side of the joint is uncommon except in the sacroiliac joint (Abdelwahab et al 1991, Ozaki et al 1997b, Drnovsek et al 1999.…”

Transarticular invasion of iliopelvic sarcomas into the sacrum: Radiological analysis of 47 cases

“…False-positive MR-findings of tumors invading a joint have been reported (Schima et al 1994). In this study, however, we used a strict definition of joint invasion requiring that the cartilage and bone of both sides of the joint were invaded by the tumor.…”

Imaging Osteosarcoma

“…DCE MRI is useful in detecting joint involvement. Although MRI is highly sensitive for detecting joint invasion, false-positive diagnoses may lead to over staging of tumor and result in unnecessarily radical surgical procedures [35]. 'High signal' intensity on T2W MRI is not reliable in predicting the Grade of parosteal OS.…”