• Arch Orthop Trauma Surg · Mar 2016

    Case Reports

    Pathological fracture of the patella due to an atypical located aneurysmal bone cyst: verification by means of ultrasound-guided biopsy.

    • Michaela Plaikner, Hannes Gruber, Benjamin Henninger, Leonhard Gruber, Juana Kosiol, and Alexander Loizides.
    • Medical University Innsbruck Department of Radiology, Anichstraße 35, Innsbruck, 6020, Austria.
    • Arch Orthop Trauma Surg. 2016 Mar 1; 136 (3): 315-9.

    IntroductionWe report on a rare case of an atypical located aneurysmal bone cyst (ABC) in the patella presenting with pathological fracture after trauma.Materials And MethodsUsing all available diagnostic modalities and by means of ultrasound-guided core-needle biopsy an unclear and suspected pathological fractured cystic bone lesion in the patella of a young man could be further clarified.ResultsThe acquired images suggested the diagnosis of a pathological fractured aneurysmal bone cyst after mild trauma. However, due to the extraordinary location and clinical presentation the diagnosis was secured by means of ultrasound-guided biopsy through a small cortical gap.ConclusionAs shown in this rare case of an atypical aneurysmal bone cyst of the patella, the quite seldom but sometimes possible ultrasound-guided biopsy of intraosseous lesions can help to achieve the diagnostic clarification and should also be taken into account as a non-standard procedure.

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