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19b - Answer: 70-year-old male presents with lump on right forearm

Pomeranz, Stephen
Stephen J Pomeranz, MD
Chief Medical Officer, ProScan Imaging. Founder, MRI Online
Includes DICOM files

HISTORY: 

This 70-year-old male presents with lump on right forearm.

(QUIZ ANSWER) PRIMARY FINDING IN THIS CASE: 

Schwannoma.

Using the diagnostic web viewer, we have provided images that assist in telling our clinical story. Areas of significance are indicated below.

FINDINGS:

Subjacent to the gel marker and arising from the ulnar nerve proximal to Guyon's canal is a 1.5cm x 1.2cm x 1.9cm T2 hyperintense mass. The mass is typical of a nerve sheath tumor such as neurofibroma or most likely a schwannoma. 

No acute muscle or myofascial strain. Remainder of the neurovascular bundles are normal. 

No osseous contusion or macrofracture. No additional soft tissue mass. 

IMPRESSION:

Moderate sized 1.9cm heterogeneous T2 hyperintense mass arises from the ulnar nerve proximal to Guyon's canal and is typical of a nerve sheath tumor such as neurofibroma or most likely a schwannoma.

LESSON 2, TOPIC 57

Case Challenge: Forearm MRI Cases

Case Challenge

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Content reviewed: July 19, 2021

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