Challenges in imaging and histopathological assessment of a giant cell tumour with secondary aneurysmal cyst in the patella.
The patella is an uncommon site for all primary and metastatic bone tumours and primary intra-osseous tumours of the patella are very rare. A majority of the patella tumours are benign. We report a patient with a sudden onset swelling and pain of the right knee following a staircase fall. The plain radiograph showed an expansile multiseptated patella lesion and it was further assessed with an MRI. The radiological findings and the initial histopathological features from a limited sample were suggestive of a primary aneurysmal bone cyst. However, the final histopathological diagnosis from a more adequate specimen was a giant cell tumour with a secondary aneurysmal bone cyst.
Department of Radiology, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia.
Soo Fin
SF
Low
Mohammad
M
Hanafiah
Md Isa
MI
Nurismah
Aziz
A
Suraya
D000058:Accidental Falls; D017824:Bone Cysts, Aneurysmal / Q000000981:diagnostic imaging / Q000209:etiology / Q000473:pathology; D018212:Giant Cell Tumor of Bone / Q000150:complications / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D010329:Patella / Q000000981:diagnostic imaging / Q000473:pathology; D011859:Radiography; D055815:Young Adult