Intramuscular lipoma of deltoid
Patient complaints of pain and restricted movements of shoulder in internal rotation and overhead abduction.
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Extended MRI study of shoulder joint showed a well defined oblong lipomatous lesion underneath the deep fascia, insinuating, splaying and extending under the anterior fibres of deltoideus muscle. This fatty SOL was seen to extend craniocaudally from the level of humeral head upto 4cm prior to the insertional deltoid tuberosity at midshaft of humerus .
These findings are compatible with subdeltoid intramuscular lipoma.
2 case questions available
Lipomas are common benign soft tissue tumors, well capsulated, mostly resectable and occuring practically anywhere. Lipomas account for almost 50%of all soft tissue tumors and affect 1% of the general population, incidence peak being 40-60 years. They are classfied as many histological types based on various lipomatous tissue subtypes. They may be grossly classified by location, ie, superficial and deep lipomas. Deep lipomas may be intramuscular or intermuscular.
Intramuscular lipoma is an unusual and rare entity. They can be well circumscribed or infiltrative.
What is even more unsusual is the patients presentation, in this case, she presented with restricted abduction at shoulder, also on internal rotation and flexion, there was a well defined bulge at the anterior soft tissues which disappeared on neutral positioning : typically attributable to the flexion of the anterior fibres of deltoid underlying which the lipoma was seated.
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- Kapetanakis S, Papathanasiou J, Dermon A et-al. Unusual intramuscular lipoma of deltoid muscle. Folia Med (Plovdiv). 2010;52 (2): 68-71. Pubmed citation
- Nishida J, Morita T, Ogose A et-al. Imaging characteristics of deep-seated lipomatous tumors: intramuscular lipoma, intermuscular lipoma, and lipoma-like liposarcoma. J Orthop Sci. 2007;12 (6): 533-41. doi:10.1007/s00776-007-1177-3 - Pubmed citation
- Grandbois L, Vade A, Lim-Dunham J et-al. MRI findings of an intermuscular lipoma in a 2-year-old. Pediatr Radiol. 2006;36 (9): 974-6. doi:10.1007/s00247-006-0227-x - Pubmed citation
- Ferrari L, Haynes P, Mack J et-al. Intramuscular lipoma of the supraspinatus causing impingement syndrome. Orthopedics. 2009;32 (8): . doi:10.3928/01477447-20090624-24 - Pubmed citation