Abstract
Giant cell tumor (GCT) found mostly in the long bones metaphysis or epiphysis. GCT usually occur between the ages of a third and fourth decade and locally aggressive. Giant-Cell Tumor seldom affects the patella. Multicentric forms rarely reported. A fourteen-year-old female with a lump at her left patella since one-year associated with slight pain that aggravated by activity for six months. Plain X-ray left knee AP, and lateral views reveal expansile lytic lesion in left patella with thinning of the anteroinferior cortex and sclerotic septa within. MRI of left knee shows approximately 3x2x2 cm heterogeneous lobulated expansile soft tissue mass in left patella extending up to the patellofemoral joint with fluid-fluid appearance. From fine needle aspiration cytology, resulting giant-cell tumor with the differential diagnosis of an aneurysmal bone cyst. The operation already performed. Curettage, bone graft, and a biopsy taken. An immunocytochemical smear was performed and confirmed as a patellar giant-cell tumor. Six months after excision of the tumor, the patient complained no arthralgia and have a full range of motion for the knee. Keywords: Giant-cell tumor, knee lump, knee pain, patella
Highlights
Many cases of giant cell tumor (GCT) found in long bones metaphysis or epiphysis
This lesion most often located around the knee joint, originates at the epiphysis, spreads to the metaphysis and makes the cortex erode in 25% of the cases
This article reported a left patellar GCT which diagnosed on fine needle aspiration cytology, magnetic resonance imaging and already performed excision, curettage, and bone cement
Summary
Many cases of giant cell tumor (GCT) found in long bones metaphysis or epiphysis. GCT usually occur between the ages of a third and fourth decade, it is locally aggressive and has metastatic potential [1,2]. Plain radiograph of the left knee anteroposterior (AP) and lateral views post-surgery taken to confirm the bone substitution component fills in the defect (Fig. 6). Histopathological examination was performed after the surgery and showed multinucleated giant cell with more than 20 nuclei, spindle-shaped short cells, calcification and bone tissues with few mitotic figures and no cellular atypia observed. By this findings, the lesion diagnosed as a GCT instead of an aneurysmal bone cyst (Fig. 7). The patient regains a full motion six months after surgery and has no arthralgia of the knee
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