Multicentric giant cell tumour involving the patella.
نویسندگان
چکیده
A 36-year-old woman had initially been seen in January 1987 because of a swelling on her left lower leg after a fall. The mass had increased slightly in size and was painful on palpation but not on walking. Radiography showed a lytic lesion within the proximal fibula, so she underwent resection of her left proximal fibula. She was seen in October 1996 complaining of persistent pain and a feeling of instability in her right knee. She dated the onset of the current symptoms to a minor fall and resultant injury to her right knee in April of that year, and she was treated with conservative management for what she was told was an undisplaced fracture of her patella. Review of the original radiograph obtained in April 1996 showed an undisplaced fracture at the superior pole of her right patella with possible underlying cystic changes (Fig. 1). A lateral view of the right knee obtained in January 1997 showed an enlarged patella and definite cystic changes within the bone (Fig. 2). Magnetic resonance imaging showed abnormal enlargement and sclerosis of the patella. The normal, bright T1-weighted marrow signal was replaced by a homogeneous low signal. On T2-weighted images, a linear high signal could be seen extending across the bone, consistent with a fracture (Fig. 3). The radiologic appearance was considered unusual and the possibilities of a hematoma, secondary infection or a nonaggressive tumour of the patella such as a GCT, fibrous dysplasia or aneurysmal bone cyst were considered. The patient underwent arthroscopic examination of her right knee in March 1997. This demonstrated replacement of the articular cartilage by fibrous tissue on the inferior surface. The pain, however, persisted and Brief Communication Communication abrégée
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عنوان ژورنال:
- Canadian journal of surgery. Journal canadien de chirurgie
دوره 44 3 شماره
صفحات -
تاریخ انتشار 2001