@entity121 are common sporting injuries, but occasionally a tear of the rectus femoris muscle can appear as a soft tissue mass of the anterior thigh with or without a significant history of @entity130 . Between 1992 and 1996, seven @entity1 were referred to the Orthopaedic Oncology Unit at Walter Reed Army Medical Center with an unexplained soft tissue mass of the thigh. Three were active duty soldiers, three were military dependents, and one was a retired serviceman. All @entity1 were @entity1 , and the mean age was 32 years (range, 15 to 73). A palpable, mildly tender mass was confirmed on clinical examination. Laboratory studies and plain radiographs were normal. Magnetic resonance imaging showed an obvious, but often ill-defined, lesion at the musculotendinous junction of the rectus femoris muscle. Four @entity1 subsequently underwent a tissue biopsy to rule out a soft tissue @entity242 . Histologic studies showed @entity82 , @entity121 , and chronic inflammatory cells with no evidence of @entity5 . A chronic rectus femoris @entity121 can mimic a soft tissue @entity5 or @entity242 and needs to be excluded in the differential diagnosis. These tears may occur acutely or may represent an @entity7184 caused by repeated microtrauma. Careful history taking, physical examination, and selective radiographic studies, specifically magnetic resonance imaging, can confirm the diagnosis of @entity121 and full functional recovery can be anticipated.

Rectus femoris XXXX appearing as a pseudotumor.

@entity1 :: ('9606', 'Species') :: ['patients', 'men'] @entity82 :: ('MESH:D005355', 'Disease') :: ['fibrosis'] @entity7184 :: ('MESH:D012090', 'Disease') :: ['overuse injury'] @entity242 :: ('MESH:D012509', 'Disease') :: ['sarcoma'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'malignancy'] @entity121 :: ('MESH:D009135', 'Disease') :: ['degeneration of muscle fibers', 'Quadriceps muscle strains', 'muscle tear'] @entity130 :: ('MESH:D014947', 'Disease') :: ['trauma']
@entity121 :: (MESH:D009135,Disease) :: ['muscle tear']
