PMC5043391_01
Preoperative appearance of the mass, with a black mark lateral to its edge.
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On physical examination, a mass 3.0 x 3.5 cm appeared on the right sub-brow region (Fig. 1).
T-2 weighted image for the brain, showing a fairly deep located bright AML lesion.
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T1, hyper-intense on T2-weighted images, partially suppressed on FLAIR images and showed heterogeneous enhancement in post contrast images, MRI also showed very clearly the black-rim around the mass which represents the interface between the mass and normal adipose tissue, (Fig. 2). The lesion was surgically excised under general anesthesia, using a curvilinear incision over the mass itself.
Low power microscopic image showing the convex margin of the lesion, composed of admixture of mature fat cells separating collagen fibers and blood vessels (H&E x4).
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Histopathological examination showed a lobular lesion composed of proliferating vascular network associated with fatty tissue and varying amount of myxoid stroma (Fig. 3, Fig. 4).
Alcian Blue, pH 2.5 shows reactive myxoid stroma (blue) separating vascular channels, with scatter of mature fat cells separating collagen fibers and blood vessels.
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PAS (Fig. 5). Proliferative index was low at <1% by Ki-67.