PMC5079381_01
Transverse (A) and coronal (B) sections of a T2-weighted magnetic resonance imaging showing a solid-cystic mass in the right lower quadrant originating from de greater omentum.
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Abdominal magnetic resonance showed a solid-cystic loculated right lower quadrant mass originating from the omentum (Fig. 1). Biopsy revealed a solid and cystic tumor measuring 26 x 17 x 6 cm, weighting 778 g (Fig. 1).
Multiloculated tumor with solid and cystic component and hemorrhagic areas, partially surrounded by adipose tissue (A). Ovoid cells with vesicular nucleus and eosinophilic cytoplasm showing numerous mitosis (H&E, x40) (B). Moderately cellular area with fusiform cells arranged in a reticular pattern in fibromixoid stroma (H&E, x4) (C). Immunohistochemistry study showing fusiform cells positive for H-caldesmon (x10) (D). Tumor cells positive for Actin (x10) (E).
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BCL2, and negative for Desmin, CD34, DOG-1, CD117, S-100, EMA and total cytokeratines (Fig. 2). Based on this immunohistochemical pattern, a leiomyosarcoma of the greater omentum was established.