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MRI manifestations of bowler's thumb

Martha F Showalter, Donald J Flemming, Stephanie A Bernard

    Radiology Case Reports
    |June 17, 2016
    PubMed

    Insights

    Bowler's thumb, a rare condition causing thumb pain and neuropathy, results from repetitive thumbhole impact. MRI reveals characteristic nerve changes, aiding diagnosis and differentiating it from other soft tissue tumors.

    Area of Science:

    • Orthopedics
    • Sports Medicine
    • Neurology

    Background:

    • Bowler's thumb is a rare perineural fibrosis affecting the ulnar digital nerve of the thumb.
    • It is characterized by pain, neuropathy, and a palpable mass lesion.
    • The condition arises from chronic, repetitive trauma from a bowling ball's thumbhole.

    Observation:

    • This case report details a patient presenting with symptoms consistent with bowler's thumb.
    • Magnetic Resonance Imaging (MRI) was utilized to visualize the affected area.
    • Specific imaging characteristics were noted around the ulnar digital nerve.

    Findings:

    • MRI demonstrated decreased signal intensity on both T1- and T2-weighted images.
    • These signal changes were observed surrounding an enlarged ulnar digital nerve.
    • The imaging findings present a diagnostic challenge, mimicking other soft tissue tumors.

    Implications:

    • Accurate diagnosis of bowler's thumb is crucial for appropriate treatment.
    • MRI findings can aid in differentiating bowler's thumb from giant-cell tumor of the tendon sheath or peripheral-nerve-sheath tumors.
    • Understanding these imaging characteristics improves diagnostic accuracy in sports-related nerve injuries.
    Keywords:
    MRI, magnetic resonance imaging

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