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. 2019 Jun 30;35(3):152-154.
doi: 10.3393/ac.2018.03.11. Epub 2019 May 31.

Primary Undifferentiated Pleomorphic Sarcoma of the Colon Mesentery

Joo Hyun Lee  1 , Dong Baek Kang  1 , Won Cheol Park  1
Affiliations

Primary Undifferentiated Pleomorphic Sarcoma of the Colon Mesentery

Joo Hyun Lee et al. Ann Coloproctol. .

Abstract

An undifferentiated pleomorphic sarcoma (UPS), also known as a malignant fibrous histiocytoma in the past, commonly involves the soft tissue of the extremities and the retroperitoneum. However, a primary UPS of the colon mesentery is very rare. A 69-year-old male patient visited our outpatient department for treatment of an enlarged, palpable mass in the right lower quadrant (RLQ). Computed tomography showed a 15-cm multilobulated, heterogeneous, enhanced mass in the RLQ, which we suspected originated from the colon. He underwent a right hemicolectomy, and the pathologic result was a colon mesenteric UPS. We report a rare case of a primary UPS of the colon mesentery and discuss the characteristics of this neoplasm in reference to the literature.

Keywords: Malignant fibrous histiocytoma; Mesentery; Undifferentiated pleomorphic sarcoma.

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Conflict of interest statement

No potential conflict of interest relevant to this article was reported.

Figures

Fig. 1.
Fig. 1.
The computed tomography findings of undifferentiated pleomorphic sarcoma show a 15-cm multilobulated heterogeneous enhanced mass in the right lower quadrant. We suspect that the mass originated from the colon.
Fig. 2.
Fig. 2.
Gross pathologic findings of undifferentiated pleomorphic sarcoma show a huge mass measuring about 18 cm × 14 cm × 13.5 cm. The mass originated from the colon mesentery and encased the ascending colon. The red arrow indicates the cecal lumen.
Fig. 3.
Fig. 3.
(A) Microscopic pathologic findings show a storiform arrangement consisting of spindle cells and histiocyte-like cells (H&E, ×100). (B) The immunohistochemical staining was positive for alpha1-antichymotrypsin (×100).
See this image and copyright information in PMC

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