Secondary Aneurysmal Bone Cystic Change of the Chondroblastoma, Mistaken for a Primary Aneurysmal Bone Cyst in the Patella
- Author:
Jin Wha CHUNG
1
;
Hwa Sung LEE
Author Information
1. Department of Orthopaedic Surgery, Yeouido St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea. hslee1003@catholic.ac.kr
- Publication Type:Case Report
- Keywords:
Patella;
Chondroblastoma;
Secondary aneurysmal bone cyst
- MeSH:
Adult;
Aneurysm;
Bone Cysts;
Chondroblastoma;
Curettage;
Cytoplasm;
Diagnosis;
Eosinophils;
Female;
Follow-Up Studies;
Giant Cells;
Humans;
Knee;
Magnetic Resonance Imaging;
Patella;
Transplants
- From:The Journal of Korean Knee Society
2014;26(1):48-51
- CountryRepublic of Korea
- Language:English
-
Abstract:
A 29-year-old woman complained of a 3-month history of left knee pain without trauma history. X-ray showed a well-defined osteolytic lesion with a sclerotic margin in the patella and magnetic resonance imaging showed T1-low and T2-high signal intensity with different fluid level. Our impression was an aneurysmal bone cyst. At surgery, the lesion was a blood-filled cystic cavity, surrounded by a gray or brownish tissue. Hemorrhagic soft tissues with recognizable bone fragments were observed. Curettage and autogenous bone graft was done. Microscopically, sheets of tumor cells were intermingled with some areas of eosinophilic chondroid matrix. The tumor cells showed oval-shaped nuclei with moderate eosinophilic cytoplasm. Several multinucleated giant cells and blood filled cystic cavities were observed. The final diagnosis was a chondroblastoma with a secondary aneurysmal bone cyst. At the post-operative 1.5-year follow-up, grafted bones were well incorporated radiographically and there were no recurrent evidence or any other abnormal symptoms.
