MR shows displacement of brachial artery and vein so neural origin has to come in consideration. It is moderate iso-hyperintense on T1 with moderate Gd-DTPA uptake.
Here are some pictures I' ve found on a quick websearch (I do not own this pictures):
http://www.ultrasoundcases.info/Slide-View.aspx?cat=438&case=1966
http://www.jortho.org/2007/4/2/e37/index.htm
Schwannoma, also known as neurilemmoma, is a benign soft tissue tumour arising from the schwann cells of the nerve sheath. Schwannomas are usually solitary and encapsulated.
Is one of the few truly encapsulated neoplasms of the human body and is almost always solitary. It’s most common locations are the flexor surfaces of the extremities, neck, mediastinum, posterior spinal roots, and cerebellopontine angle. The nerve of origin often can be demonstrated in the periphery, flattened along the capsule but not penetrating the substance of the tumor. Since this is a benign neoplasm every attempt should be made to preserve the nerve.
The Schwannoma (neurilemmoma) is the most common tumor of the peripheral nerve, it accounts for 8% of all primary intracranial tumors and 80-90% of those in the cerebellopontine angle. The peak incidence is in the third to sixth decades, with a slight female predominance. Intracranially there is a predilection for sensory nerves especially the vestibular branch of the eighth nerve. Rarely, schwannomas occur intraparenchymally within the brain, cerebellum, or spinal cord: in such rare instances, they presumably arise from schwann cells that accompany blood vessels.
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This was an outpatient and was reffered to a Peds Surgeon in other hospital.
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