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Soft Tissue Tumors
Lipoma of tendon sheath
Author: Nat Pernick, M.D., PathologyOutlines.com, Inc.
Reviewer: David Lucas, M.D., University of Michigan Health Systems (January 2009)
Revised: 26 June 2009, last major update June 2009
Definition
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● Lipoma attached to tendon
Terminology
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● Not a WHO diagnosis
● May be a variant of lipoma arborescens
Epidemiology
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● Very rare
● Adults age 40 years or less
Sites
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● Tendons of hands and wrist
● Less often ankle and foot
Case reports
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● Causing carpal tunnel syndrome (Orthop Rev 1988;17:1083)
● Causing quadriceps tendon rupture (Cir Cir 2008;76:259)
Gross description
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● Focal lipomatous mass resembling lipoma
Gross images
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Nodular masses attached to
tendon that resembles lipoma
arborescens (fig 1A)
Micro description
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● Resembles lipoma, but adherent to tendon or intersecting its fibers
Micro images
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Polypoid masses resembling
lipoma arborescens (fig 1B)
Differential Diagnosis
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● Lipoma arborescens - usually not a discrete mass, affects knee, not hands/wrist
End of Soft Tissue Tumors > Lipoma of tendon sheath
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