Abstract
Ossicle vs. avulsion fracture: Cinematic rendering of MDCT data as an additional diagnostic key
Highlights
The differentiation between variants within the normal range and pathologic findings is a frequent challenge to radiologists in the daily routine
3D cinematic rendered images clearly confirmed that the bone dense structure was an ossicle in the intercondylar eminence (Figure 3)
In difficult anatomic regions it might be hard to differentiate between variations within the normal range and pathological findings even in MDCT images [5]
Summary
The differentiation between variants within the normal range and pathologic findings is a frequent challenge to radiologists in the daily routine. In trauma patients for example, it may be difficult to differentiate an ossicle from an avulsion fracture, even in crosssectional images [1]. Through their relation to tendons or ligaments, avulsion fractures are frequently considered as “complex fractures” and require conservative and - in some cases - surgical management [2,3,4]. We present a case in which cinematic rendering of MDCT data was a helpful key in the differentiation between an ossicle and an avulsion fracture. After initial clinical examination and plain radiograms of the knee an avulsion fracture of the intercondylar eminence was suspected, differential diagnosis ossicle (Figure 1). Conventional MDCT images confirmed the bone dense formation close to the intercondylar eminence, suspicious of an ossicle. 3D cinematic rendered images clearly confirmed that the bone dense structure was an ossicle in the intercondylar eminence (Figure 3)
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