OBJECTIVE: To review the risk factors and the radiological appearance of @entity1642 and acetabular roof. DESIGN AND @entity1 : Twenty @entity1 with sacral and acetabular roof insufficiency @entity174 were reviewed retrospectively. There were 16 @entity1 (80%) and 4 males (age range 48-86 years, excluding an 8-year-old @entity1 ). Thirteen @entity1 had a known @entity5 , and nine had received pelvic irradiation. All @entity1 , except one who was asymptomatic, presented with @entity1643 . In @entity1 with a known @entity5 , @entity3 were suspected. Plain radiography (20), bone scintigrams (16), MR examinations (20), and bone densitometry (14) were performed. Nine @entity1 also each had a CT scan. RESULTS AND CONCLUSIONS: In three cases the CT scan performed 10-25 days after onset of symptoms was interpreted as normal. MR examination performed a few days after the CT scan showed in each of these three @entity1 a @entity174 line with a band of @entity4 . Scintigraphy was very sensitive, but the H-shaped pattern of sacral uptake, specific for an insufficiency @entity174 , was detected in only three of 16 cases. The earliest MR sign was medullary @entity4 , seen as early as 18 days after the onset of symptoms. On spin echo (SE) T1-weighted images (T1WI), the hypointense signal of @entity4 could mask a @entity174 line. On SE T2WI the @entity174 line could be detected within the hyperintense @entity4 (10 of 17 @entity1 with examinations including SE T2WI). However, in four @entity1 a @entity174 of the sacrum was not seen on T2WI, these having been obtained in the axial plane. For this reason, intravenous @entity2287 was injected, revealing a @entity174 line in 12 of 14 examinations, or fat suppression sequences were performed, revealing a @entity174 line in five of five cases. The total number of @entity174 detected was 17 [15 @entity174 of the sacrum (bilateral in 10 cases) and two of the acetabular roof]. At a later stage, the @entity4 resolved and the @entity174 was clearly seen. The two cases of @entity174 of the acetabular roof were easily recognized at MRI, particularly in the sagittal plane.

Role of MRI in the diagnosis of XXXX and acetabular roof.

@entity1 :: ('9606', 'Species') :: ['women', 'patients', 'PATIENTS', 'boy'] @entity1643 :: ('MESH:D017116', 'Disease') :: ['low back or hip pain'] @entity174 :: ('MESH:D050723', 'Disease') :: ['fractures', 'fracture'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'tumour'] @entity4 :: ('MESH:D004487', 'Disease') :: ['edema'] @entity3 :: ('MESH:D009362', 'Disease') :: ['metastases'] @entity2287 :: ('MESH:D005682', 'Chemical') :: ['gadolinium'] @entity1642 :: ('MESH:D015775', 'Disease') :: ['insufficiency fractures of the sacrum']
@entity1642 :: (MESH:D015775,Disease) :: ['insufficiency fractures of the sacrum']
