Bizarre Parosteal Osteochondromatous Proliferation– A Case Series of Typical and Atypical Presentations

INTRODUCTION: Bizarre parosteal osteochondromatous proliferationis a distinct entity which requires proper radiological and pathological distinction for correct surgical management. CASE REPORT: We present a series of four cases which were misdiagnosed by the treating surgeons, reporting radiologists and pathologists due to clinical and investigatory consistencies with other benign or malignant orthopedic tumors. Due to common diagnostic errors of these uncommon tumors, the patients had recurrence and required multiple invasive procedures which could have been avoided with high index of suspicion. CONCLUSION: Dueto high local recurrence rates and a lack of adjuvant therapy options, this lesion will continue to pose a challenge for orthopedic surgeons and more awareness ofthis lesion will help identify and understand that a wide excision, with no compromise related to the margins, is required for this benign-appearing lesion.