Schwannoma (thigh)

Case contributed by Dr Maulik S Patel

Presentation

Anterior mid thigh swelling for 3 years. No trauma. No significant pain.

Patient Data

Age: 11 years
Gender: Female
Ultrasound

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)

Location

  • within superficial part of vastus lateralis muscle
  • abutts fascia
  • separate from bone

Morphology

  • 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.      

Case Discussion

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. 

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