Anterior mid thigh swelling for 3 years. No trauma. No significant pain.
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There is a well-defined ovoid lesion in the region of interest.
Size: 40 mm (cranio-caudal) x 35 mm (transverse) x 20 mm (anteroposterior)
- within superficial part of vastus lateralis muscle
- abutts fascia
- separate from bone
- hypoechoic without calcification / cystic changes
- lobulations present
- posterior acoustic enhancement present
- not significantly compressible
- echogenicity around lesion with echogenic triangular 'cap' at proximal and distal end of the lesion
Doppler: significant vascularity is noted in the lesion.
The lesion is a solid tumor with vascularity involving muscle of thigh. There was echogenic cap at proximal and distal end of lesion which is described in myxoma; however, there were few points against that diagnosis.
Surgical excision was done. Histopathological diagnosis: Schwannoma.