| 0303-215 Copcu
Copcu E, Sivrioglu NS.
Posttraumatic lipoma: analysis of 10 cases and explanation of possible
mechanisms. Dermatol Surg. 2003 Mar;29(3):215-20. PMID: 12614411
Plastic and Reconstructive Surgery Department, Medical Faculty, Adnan Menderes
University, Aydin, Turkey. ecopcu@du.edu.tr
BACKGROUND: Trauma and lipoma are the most frequently met occurrences in
clinical routine. Although lipomas are well-known fatty tumors both clinically
and pathologically, the precise etiology is still unknown. Generally,
posttraumatic lipomas are known as "pseudolipoma," which describes herniation of
deeper fat through Scarpa's layer secondary to trauma. Here we present 10
patients with lipoma secondary to blunt trauma in different anatomical sites.
OBJECTIVES: To correlate trauma and lipoma relationships and to discuss the
possible pathogenetic mechanism by reviewing literature. METHODS: Ten patients
(12 lipomas) after blunt trauma were presented, and data of patients were
reviewed. Ultrasonography and/or nuclear magnetic resonance were employed for
diagnosis in addition to physical examination. All tumors were verified by
histopathologic examinations. Patients were followed for a minimum of 6 months.
RESULTS: The average age was 34. Four of the lesions (12 altogether) were
located on an upper extremity, 5 on a lower extremity, 2 on the trunk, and 1 on
the neck. Excision of tumors and primary closure were performed in 92% of the
lesions, and only one liposuction was performed. Aesthetic results were achieved
in all patients. There were no complications and recurrences. CONCLUSION: The
effect of blunt trauma on fat tissue may be explained by different theories. We
summarized possible mechanisms into two groups according to our observations and
review of the literature: The first was related to mature adiposities and mainly
a mechanical effect, and the second was differentiations of the preadipocytes to
lipoma by the promoting factors. We speculate that only traumas that serve as a
cause of fat necrosis may trigger the formation of the lipoma, and local
inflammation secondary to fat necrosis may affect adipocytes and promote new
formation of lipoma.
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