Aneurysmal Bone Cyst: an uncommon and aggressive presentation
Keywords:
Aneurysmal bone cyst, Solid variant, Bone neoplasms, Giant cell reparative granuloma.Abstract
The solid variant of  is a rare subtype of aneurysmal bone cyst with a preponderance of solid compared to cystic elements. We present a case of solid ABC affecting the proximal tibia-an unusual site, and presenting with rapid progression mimicking malignant neoplasm.
12 year old girl presented with pain and swelling just below left knee for 9 months. X-Ray and CT scan demonstrated a lytic expansile lesion over metaphyseal region of tibia and diagnosed radiologically as aneurysmal bone cyst. Histology of curettage established it as solid variant of ABC. After 5 months, patient presented with a fungating mass over skin below knee with foul smelling discharge. Histology of incisional biopsy from outside suggested osteosarcoma, though no osteoid was found. Above knee amputation was done and histology of the whole specimen conclusively proved it to be a case of solid variant of ABC.Â
Solid ABC has been of great interest because it may be mistaken for malignant tumor, mainly giant cell tumor, osteosarcoma or synovial sarcoma, because of cellularity and variable mitotic activity.
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Copyright (c) 2015 Arnab Chaudhuri, Ayandip Nandi, Sarbani Chattopadhyay, Ranajit Bhatta
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