J Korean Bone Joint Tumor Soc.  2014 Jun;20(1):27-31. 10.5292/jkbjts.2014.20.1.27.

Painful Snapping Shoulder Complicating Soft Tissue Pseudotumor Secondary to Rib Osteochondroma: A Case Report

• Moon MS
• Jeon DJ
• Kim SS
• Yoon MG

• KMID: 1707762
• DOI: http://doi.org/10.5292/jkbjts.2014.20.1.27

Abstract

Osteochondromadevelop most commonly at distal femur, proximal humerus and proximal tibia, but the rib osteochondroma was reported less commonly. In this report, scapular snapping syndrome complicated by adventitious bursa and soft tissue pseudotumor surrounding the osteochondroma of the 6th rib body was treated successfully by surgical excision of them. We report this rare case with reviewing the relevant literature.

Keyword

rib; osteochondroma; scapular snapping; soft tissue pseudotumor; adventitious bursa

MeSH Terms

Femur
Humerus
Osteochondroma*
Ribs*
Shoulder*
Tibia

Figure

• 

  Figure 1. On preoperative x-ray about 1.2 cm size exophyticbony mass (white arrow) is noted on the middle part ofthe left 6th rib (A). On MRI about 1.2×1 cm sized exophytic bony lesion (white arrow) in posterolateral arc of the left 6th rib with surrounding loculated fluid-signal like collection (white arrow head) is seen (B).

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  Figure 2. Excised osteochondroma (white arrow) with surrounding soft tissue (dark arrow head) is shown. The surrounding soft tissue has soft and amorphous shape bursal sac and relatively hard pseudotumor, which cannot be demarcated well.

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  Figure 3. Histologic section shows thickened bone and cartilage fragment. The mature bone stalk is covered with well differentiated cartilagenuous cap with irregular tidemark (H&E, ×40).

Reference

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