Tar Barreler’s Hump: An Unusual Presentation of a Posttraumatic Pseudolipoma

Table 1

Summary table: posttraumatic pseudolipoma (PTL).

Etiology	Sequelae of acute, chronic, or repetitive trauma. Various mechanisms of development are postulated
Incidence	~1%
Gender ratio	F : M = 3.8: 1^*
Age	18–64 years^*
Risk factors	Acute/chronic/repetitive trauma
	Conservative
Treatment	Liposuction
	Surgical excision
Prognosis	Unknown. Malignant transformation has never been reported
Imaging	US—well-delineated hyperechoic subcutaneous mass, no posterior acoustic attenuation or enhancement
	CT—subcutaneous mass with Hounsfield attenuation of fat
	MRI—homogenous unencapsulated mass isointense to fat on all sequences
	T1WI-hyperintense (similar to fat)
	Fat-suppressed sequence—hypointense (similar to fat)
	Lack of a well-defined low signal intensity fibrous capsule
	Lack of enhancement following administration of intravenous contrast

^*Based on a review of 124 cases of PTLs by Galea et al. [1].