Abstract
A solitary extraskeletal osteochondroma was diagnosed in a 6-year-old, castrated male Burmese cat, positive for feline leukaemia virus (FeLV). The cat presented with a rapidly growing, solid, non-painful mass on the craniolateral aspect of the left elbow. Radiographs revealed an oval, well circumscribed 2.0 cm × 1.5 cm × 1.5 cm mineralised mass separated from the underlying bone. Surgical excisional biopsy confirmed the diagnosis. Feline extraskeletal osteochondromas are benign tumours frequently seen in FeLV-positive cats which can transform into osteosarcomas or chondrosarcomas. Radiographically, they cannot be distinguished from a parosteal or an extraskeletal osteosarcoma.
Highlights
Feline skeletal osteochondromas account for 20% of primary benign bone tumours (Gradner et al 2008) and they appear as sessile, bony masses with a trabecular pattern and smooth margins (Barr 2005; Dernell 2003; Dernell et al 2005; Doige 1987; Gradner et al 2008; Mahoney & Lamb 1996; McAllister & Tobin 2005; Pool & Carrig 1972; Ranade & Pacchiana 2011; Tan et al 2010; Wood, Grant & McKlveen 2002)
No effective treatment exists for feline osteochondromas because of the aetiology, but surgical excision with wide margins has been described as the treatment of choice in doi:10.4102/jsava.v83i1.104
Surgical removal is difficult because of the cartilaginous component tending to blend with the adjacent tissues, resulting in frequent recurrences of the lesions (Levitin et al 2003), as in the re-growth of the initial osteochondroma in this case
Summary
Feline skeletal osteochondromas account for 20% of primary benign bone tumours (Gradner et al 2008) and they appear as sessile, bony masses with a trabecular pattern and smooth margins (Barr 2005; Dernell 2003; Dernell et al 2005; Doige 1987; Gradner et al 2008; Mahoney & Lamb 1996; McAllister & Tobin 2005; Pool & Carrig 1972; Ranade & Pacchiana 2011; Tan et al 2010; Wood, Grant & McKlveen 2002). One month later, the cat presented with another 0.5 cm × 0.3 cm × 0.3 cm mass in the exact same location and with the same clinical and radiographic characteristics as the original osteochondroma (Figure 4). This second mass was surgically removed and histopathology confirmed it to be an osteochondroma. Four months after the second surgery the tumour showed no signs of recurrence
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