PMC4293553_01
A large mass forming lesion with mottled air density is observed in ascending colon.
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F1
Tumor cells were mostly spindle cells, but occasional bizarre nuclei and very rare mitotic figures (less than 1/10 high power field) were also observed. A preoperative CT scan on admission showed a large, homogenous, smoothly outlined, low-attenuation tumor mass in the pelvis, close to the ascending colon (Fig. 1).
Gross findings of the specimen revealed multiple yellowish capsulated mass measuring up to 12 x 11 x 5 cm. The mass was located in the subserosa of the ascending colon.
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F2
Two ulcerated lesions involving the tumor (meaning is unclear) were observed in the colonic mucosa (Fig. 2).
Microscopic findings consist large pleomorphic cells, highly vacuolated and lipid rich cells, and lipoblats (H&E, x400).
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F3
These findings were consistent with pleomorphic liposarcoma (Fig. 3), and the tumor was determined to be of histological grade 2, according to the FNCLCC system.