Unusually Giant Solitary Osteochondroma of the Ilium: A Case Report with Review of Literature.

Introduction: Osteochondroma is the most common benign bone tumor where a chondrogenic lesion is derived from aberrant cartilage from the perichondral ring. Although it commonly arises from the growing ends of long bones, less commonly, it may arise from the scapula, pelvis, or vertebra. Case Report: We encountered a 16-year-old male patient with a painless left pelvic solid mass for 3 years, which was suggestive of osteochondroma on X-ray and magnetic resonance imaging findings. Besides cosmetic issues, the main indication for surgery was the constant discomfort in wearing pants/shorts/belts. He underwent en bloc excision followed by a biopsy of the surgical specimen by two independent histopathologists confirming the tumor to be osteochondroma. He was followed up for 2 years with no signs of post-operative complications or recurrence. This case represents one of the very few reported so affecting the iliac wing, where the excision was performed before skeletal maturation. We also performed a review of the current literature on iliac wing osteochondroma to understand the tumor better, identify gaps in current knowledge, and suggest areas for future research. Conclusion: Since one of the differential diagnoses includes secondary chondrosarcoma, which could be a rare progression of osteochondroma, early recognition and comprehensive evaluation of such unusual cases needs to be dealt with a high index of suspicion to avoid misdiagnosis and to provide effective treatment.