Intramuscular Chondroid Lipoma: Magnetic Resonance Imaging Diagnosis by ‘Fat Ring Sign’

Abstract

Magnetic resonance imaging findings of a chondroid lipoma may be heterogenous according to the distribution of the fatty and chondroid tissue. However, in the presence of "fat ring sign," radiologists should consider a diagnosis of chondroid lipoma preoperatively.

Characteristics of chondroid lipoma

“…The surrounding adipose tissue exhibited a signal stronger than that of muscle on the T1WI and T2WI, and heterogeneous fat saturation on the T2W fat-saturated image. [58]…”

The Adipocerous Ossein- Chondroid Lipoma

“…Median age of disease emergence is 36 years, and the condition can arise from 14 years to 70 years [2]. The tumefaction is accompanied by significant female predominance with a female to male proportion of 4:1 [2,3]. The exceptional, benign chondroid lipoma can arise at pertinent locations as proximal extremities or limb girdle.…”

“…Nevertheless, sites such as trunk, head and neck, oral cavity, breast and abdominal cavity may be implicated. Majority of lesions incriminate the subcutaneous tissue, superficial muscular fascia, or skeletal muscle [2,3]. On cytogenetic analysis, the neoplasm is associated with chromosomal translocation (11;16), akin to a hibernoma [2] Tumefaction can represent as a sitespecific, gradually progressive, painless, hard, mobile nodule.…”

“…On cytogenetic analysis, the neoplasm is associated with chromosomal translocation (11;16), akin to a hibernoma [2] Tumefaction can represent as a sitespecific, gradually progressive, painless, hard, mobile nodule. The condition is associated with a non-aggressive clinical course [2,3].…”

“…Tumor magnitude extends up to 11 centimeters with a median diameter of up to 4 centimeters. Cut surface is lobulated, yellowish or grey/white with glistening areas [3,4]. On fine needle aspiration cytology, mature lipocytes and lipoblast-like cells are disseminated within a chondromyxoid matrix [3].…”