PMC7752295_01
Demonstrated mass at left thigh: (a) posterior view, (b) front view.
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fig1
On physical examination, there was a firm nonpulsatile mass over left medial thigh measuring ~10 x 6 cm in diameter (Figure 1).
Computed tomography (CT) scan demonstrated 11 x 8 x 7 cm, in vertical x transverse x AP diameter of well-defined, fatty lesion with thick streak fibrous tissue at the right posteromedial of thigh: (a) axial view, (b) coronal view, and (c) sagittal view.
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fig2
The computed tomography (CT) scan demonstrated an intramuscular 11 x 8 x 7 cm, in vertical x transverse x AP diameter of well-defined, fatty lesion with thin streak fibrous tissue at the left posteromedial of the thigh (Figure 2).
Complete surgical removal of tumor.
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fig3
Complete en bloc tumor resection with total removal of semimembranosus and semitendinosus muscles was successful (Figure 3).
The gross specimen showed cut surfaces of the mass revealing pale yellow, greasy, lobulated mass with ill-defined, infiltrative edge to the surrounding muscle on one side.
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fig4
Serial sections of the mass revealed focal gradual replacement of the muscle tissue by fat into the intermuscular connective tissue spaces (Figure 4).
Microscopic examination. (a) Histological revealed characteristic multivacuolated lipoblasts. (b, c) An infiltrative, intramuscular component is composed of adipocytic lesion encasing skeletal muscle fibers. (d-f) Multivacuolated lipoblast and hyperchromatic stromal cells found in between the muscle fibers.
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fig5
No necrosis and no high-grade sarcomatous component were seen (Figure 5).