The high number of knee imaging exams at radiology clinics, together with the
wide variety of knee disorders, calls for expanding the knowledge about the less
common lesions seen in routine diagnostic practice. The purpose of this
pictorial essay was to illustrate unusual lesions that distend the knee joint,
selected by relevance and evaluated with multiple imaging modalities, including
X-ray, computed tomography, and magnetic resonance imaging, as well as to
perform a brief review of the literature.
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