Extraskeletal osteochondroma on a cat´s elbow

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.

Osteochondroma in a young cat infected by feline leukemia virus

“…This suggested the involvement of FeLV in the tumor induction, mainly when considered the cat's age; it was younger than described for osteochondroma in this species. Some authors suggested that FeLV may be related to the etiology of feline osteochondromas (POOL & CARRIG, 1972;DOIGE, 1987;ROSA & KIRBERGER, 2012), and viral particles have been observed in proliferated chondroblast membranes (POOL & CARRIG, 1972). However, mechanisms of invasion and the pathogenesis of this disease have not been fully elucidated (POOL & CARRIG, 1972;DOIGE, 1987;ROSA & KIRBERGER, 2012).…”

“…One type of neoplasm is an osteochondroma, which is a benign primary bone tumor that originates from the bone surface to form a projection covered by cartilage (THOMPSON & POOL, 2002). This tumor can be formed by one or more masses; in the latter case, it is referred to an osteochondromatosis or multiple cartilaginous exostoses (ROSA & KIRBERGER, 2012). In cats, osteochondromas have been linked to feline leukemia virus (FeLV) infections (POOL & CARRIG, 1972;THOMPSON & POOL, 2002;ROSA & KIRBERGER, 2012).…”

“…In dogs, osteochondroma has a hereditary cause (WEISBRODE, 2009), and may develop just after birth with dogs growth, while they can stabilize when the bone reaches maturity (DOIGE, 1987). However, in cats, the neoplasm often occurs in adulthood (WEISBRODE, 2009) and shows continued growth (ROSA & KIRBERGER, 2012). The age of cats with this type of tumor usually ranges from 16 months to eight years, and it is more frequently reported in cats from two to four years old (THOMPSON & POOL, 2002).…”

“…This tumor can be formed by one or more masses; in the latter case, it is referred to an osteochondromatosis or multiple cartilaginous exostoses (ROSA & KIRBERGER, 2012). In cats, osteochondromas have been linked to feline leukemia virus (FeLV) infections (POOL & CARRIG, 1972;THOMPSON & POOL, 2002;ROSA & KIRBERGER, 2012). In dogs, osteochondroma has a hereditary cause (WEISBRODE, 2009), and may develop just after birth with dogs growth, while they can stabilize when the bone reaches maturity (DOIGE, 1987).…”

“…Primary bone neoplasms in domestic cats are rare and only represent 4.9% of all tumors diagnosed in this species (ROSA & KIRBERGER, 2012). One type of neoplasm is an osteochondroma, which is a benign primary bone tumor that originates from the bone surface to form a projection covered by cartilage (THOMPSON & POOL, 2002).…”