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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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