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Severe atrophy and fatty degeneration of the infraspinatus muscle due to isolated infraspinatus tendon tear.

Summary of "Severe atrophy and fatty degeneration of the infraspinatus muscle due to isolated infraspinatus tendon tear."

Atrophy of both the supraspinatus and infraspinatus muscles is usually caused by chronic rotator cuff tear, but may also derive from suprascapular nerve entrapment at the spinoglenoid notch. Isolated infraspinatus muscle atrophy is uncommon, and typically associates with suprascapular nerve entrapment occurring distal to the spinoglenoid notch. However, isolated atrophy of the infraspinatus muscle due to insertional tear of the infraspinatus tendon may also occur. We present a case of a 43-year-old male with isolated infraspinatus muscle atrophy and fatty degeneration following an isolated full-thickness infraspinatus tendon tear at the insertion site on the humerus. While it is important to rule out other causes of infraspinatus muscle atrophy, such as concomitant rotator cuff tendon/muscle pathology or suprascapular nerve palsy, we present this case to increase awareness of this uncommon clinical presentation and the potential implications for treatment.

Affiliation

Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA, kolbe.amy@mayo.edu.

Journal Details

This article was published in the following journal.

Name: Skeletal radiology
ISSN: 1432-2161
Pages:

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Medical and Biotech [MESH] Definitions

The musculotendinous sheath formed by the supraspinatus, infraspinatus, subscapularis, and teres minor muscles. These help stabilize the head of the HUMERUS in the glenoid fossa and allow for rotation of the SHOULDER JOINT about its longitudinal axis.

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