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ISSN: 2157-7099
Journal of Cytology & Histology
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A Case of Coccygeal Bursitis Mimicking Subcutaneous Acute Inflammatory Lesion

Chi-Min Shih1, Hwei-Fan Shu2 and Ming-Tse Chen3*

1Department of Pathology, Chia-Yi Hospital, Ministry of Health and Welfare, Taiwan

2Department of Pathology, Feng Yuan Hospital, Ministry of Health and Welfare, Taiwan

3Department of General Surgery, Feng Yuan Hospital, Ministry of Health and Welfare, Taiwan

*Corresponding Author:
Ming-Tse Chen
Department of General Surgery
Feng Yuan Hospital, Ministry of Health and Welfare, Taiwan
Tel: 886-4-25271180 extn. 1691
E-mail: [email protected]

Received April 25, 2016; Accepted May 10, 2016; Published May 18, 2016

Citation: Chi-Min S, Hwei-Fan S, Ming-Tse C (2016) A Case of Coccygeal Bursitis Mimicking Subcutaneous Acute Inflammatory Lesion. J Cytol Histol 7:i101. doi:10.4172/2157-7099.1000i101

Copyright: © 2016 Shih CM, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Description

Bursa is an encapsulated structure with little lubrication fluid content, as a cushion between bony prominence and tendon, muscle or skin. Bursitis like a painful cystic mass with fluid accumulation in the synovial bursa may occur near joints.

Herein, we present a 31 year old man complaining of a painful mass on lower midline buttock for several days. He has the past history of falling down on his buttock that is on his coccyx bone, one and a half years ago. Since then, a small painless mass developed on coccygeal region. In recent days, the mass grows larger and painful. On physical examination, a 3 × 2 cm subcutaneous mass is palpable over coccygeal region without skin fistula or erythematous change.

Microscopically, skin dermis and epidermis are not affected by underlying lesion (Figures 1 and 2).

Figure

Figure 1: Scanning view of excised skin and underlying irregular cystic cavities and infolding inner wall (arrow). (A) Blue staining means presence of collagen fibers by Masson trichrome stain. (B) The enclosed rectangular area is amplified in Figure 2. (Hematoxylin & eosin stain.)

Figure

Figure 2: Inset of Figure 1. (A) Unaffected epidermis and dermal stroma. (H&E, 50X) (B) There is a relatively sharp margin between cystic lesion over right side and the unremarkable dermal stroma over left side (H&E, 50X).

The pathologic findings are irregular cystic spaces surrounded by edematous fibrous wall over subcutaneous region (Figure 3).

Figure

Figure 3: (A and B) Low power view shows edematous bursal wall and proliferation of small blood vessels over inner wall. (A: H&E, 100X, B: Trichrome stain, 50X) (C) High power view exhibits edematous collagenous outer wall and proliferation of small blood vessels over inner wall without marked inflammatory infiltrate (Trichrome stain, 200X).

Some proliferative small blood vessels (Figure 3) and some nonspecific chronic inflammatory infiltrates with focally a few neutrophils over inner wall (Figure 4).

Figure

Figure 4: (A) Some lymphocytes and a few plump histiocytes accompanied by a few extravasated RBCs can be seen over focal inner cyst wall. (H&E, 200X) (B) A few neutrophils and plasma cells could be found in focal small areas (H&E, 400X).

Fibrinous material (trichrome staining red, and PAS: +) without inflammatory infiltrate over focal inner cavity wall (Figure 5) is identified. Accordingly, bursitis with acute exacerbation or rupture is diagnosed.

Figure

Figure 5: (A) Positive PAS staining (purple-red) over fibrinous material of focal inner wall. (200X) (B and C) Masson trichrome stain reveals non-collagenous fibrinous areas of focal inner wall as red color (B: 200X, C: 100X).

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