PMC9924576_01
Doppler Ultrasound - Mass (70 x 45 x 35mm) identified within the right gluteus musculature. Mildly increased vascularity seen within the mass and at the periphery. Possible calcifications seen within the lesion.
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A colour Doppler ultrasound showed mildly increased vascularity within the mass and peripherally (see Figure 1).
Axial MRI pelvis - significant surrounding oedema (arrowheads), extending laterally to the greater trochanter and medially into the sciatic notch. A rim of hypointense calcifications (arrows) seen at the periphery of the lesion. Axial measurement is 3.4 x 2.5cm.
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There was a heterogeneously enhancing mass with thin peripheral calcification within the right gluteus maximus, with significant surrounding oedema (see Figure 2). Figure 2). Furthermore, there was no fluid in the sacroiliac joints, and no other abnormalities within the hip joint and bursae.
X-ray pelvis - typical peripheral ossification of the mature lesion (arrows).
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Four months later, oblique X-ray imaging confirmed ossification and a slight reduction in size of the lesion (see Figure 3).
Axial MRI pelvis - complete resolution of soft tissue oedema (arrowheads) surrounding the mature lesion (arrow). Central soft tissue T2 hyperintense and T1 isointense. Axial measurement is 3.1 x 2cm.
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The central lesion remained but with an increased rim of calcification and fat-based tissue (likely representing marrow fat related to developing ossification) immediately adjacent to the calcification (see Figure 4 and Figure 5).
Axial MRI pelvis - fat signal present at periphery of the lesion (arrowhead) adjacent to the rim calcification (arrow) consistent with ossification.
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The central lesion remained but with an increased rim of calcification and fat-based tissue (likely representing marrow fat related to developing ossification) immediately adjacent to the calcification (see Figure 4 and Figure 5).