Peripheral nerve sheath tumor

Case contributed by Dr Kamel Mahmoud Alkhateeb

Presentation

Swelling around elbow for 6 months, increasing in size. Sometimes painful. No trauma.

Patient Data

Age: 30 years
Gender: Female
Ultrasound

An ovoid sharply marginated hypoechoic mass measuring ~20x15x15 mm is seen at ventral aspect of the left arm, approx 4mm deep to the skin surface. It is abutting the medial border of the biceps muscle. It is located just anterior to the brachial artery. No internal cystic or necrotic component could be identified. No detectable internal vascularity is seen.

MRI

There is well-defined ovoid mildly heterogeneous soft tissue focal mass lesion in the anterior aspect of elbow associated with the neurovascular bundle (in the expected location of the median nerve), abutting the medial border of the biceps tendon and anterior aspect of brachialis muscle. No evidence of invasion to adjacent structures. It measures ~ 20 x 19 x 16 mm (in CC x AP x transverse dimensions respectively). The lesion is isointense to slightly hyperintense to adjacent muscle on T1WIs, heterogeneously hyperintense on T2WIs and hyperintense on PD.FS. The mass is surrounded by a thin low signal intensity margin. It shows enhancement on postcontrast images

Case Discussion

Peripheral nerve sheath tumors are a group of primary neurogenic tumors that arise from nerve sheaths outside of the central nervous system. The vast majority are benign, however, malignant transformation is seen particularly in large tumors and those associated with neurofibromatosis type.

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Case information

rID: 63559
Published: 9th Oct 2018
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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