PMC9521361_01
Ultrasonography images of the medial right knee (14MHz transducer). The sonographic characteristics of these findings are well-defined oval structures with an anechogenic appearance and capsule (arrows). There was no angiogenesis present or oedema around the structures. Some through transmission is present on the left-hand image.
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In the subcutaneous tissue, medially and laterally, anechogenic structures with a sharp, well-defined edge (Fig. 1) were observed with an associated posterior enhancement. A probable diagnosis of post-traumatic fat necrosis with consequent development of nodular cystic fat necrosis was seen (Fig. 1).
Magnetic resonance imaging T2 TSE fat suppression transverse sequence of the right knee with nodular cystic fat necrosis (arrows).
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An additional magnetic resonance imaging (MRI) scan was performed, confirming the visualized cysts (Fig. 2).