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Subperiosteal inflammatory pseudotumor mimicking primary malignant bone tumor: A case report
Ryu Terauchi1, Toshiharu Shirai1,2, Naoki Mizoshiri1
1a Department of Orthopaedics , Graduate School of Medical Science, Kyoto Prefectural University of Medicine , Kyoto , Japan.
Abstract:
We report a case of IgG4-positive inflammatory pseudotumor mimicking malignant bone tumor. Biopsy revealed no tumor cells. Surgical excision was performed and an abscess developing beneath the periosteum was observed with Streptococcus constellatus. Preoperative serum IgG4 value of 120 mg/dl normalized postoperatively to 80.6 mg/dl. It was difficult to distinguish inflammatory pseudotumor from sarcoma because it developed under the periosteum. In such cases, it is important to measure blood IgG4 values and perform tissue staining and culturing.
