Successful outcome and 1‐year follow‐up after partial iliectomy with limb preservation in a cat with pelvic osteosarcoma

Abstract

A 16-month-old male neutered cat was referred due to a history of right hindlimb lameness over several days. Radiography by the referring veterinarian revealed an osteolytic lesion at the right ilial wing. Haematology and blood chemistry were unremarkable besides borderline values of alkaline phosphatase (74 U/L). For further workup, thoracic, abdominal and pelvic computed tomography (CT) were performed. CT confirmed the presence of an osteolytic mass with additional osteoneogenesis in the right ilial wing and indicated no evidence of metastatic disease. Resection of the mass was carried out using partial iliectomy with preservation of the limb. Histopathology confirmed the mass as osteosarcoma. Follow-up was accomplished by radiographic re-check of the ilium every few months. On the 1-year follow-up, the cat was clinically healthy with no signs of lameness. Follow-up radiographies of the pelvis up until the time of writing this report showed no signs of tumour recurrence. DIFFERENTIAL DIAGNOSISDifferential diagnoses included benign bone lesions such as bone cysts as well as malignant bone tumours (osteosarcoma,

Vertebral Osteosarcoma in Two Cats—Diagnosis, Treatment, and Outcome

“…The mineralized component of the lesions varied from none (soft tissue attenuation [7]) to mild periosteal new bone formation [8], or a small mineralized component and/or an ossified peripheral rim [9,10]. The mass in case 2 shows similar imaging characteristics compared to a case of FVO in C7 [10] and of a pelvic FO, with a peripheral ossified border [12]. In all cases in which CT and/or MRI post-contrast images were acquired, including the two cases presented here, there was homogeneous-often strong-contrast enhancement of the mass [7,8,10].…”

“…The use and value of radiographs, CT (with or without myelography), and MRI for the diagnosis of FO and FVO has been reported [7][8][9][10][11][12][13]. Features that are reported for osteosarcoma on radiographs include cortical lysis, new bone formation (e.g., perpendicular to cortical bone (sunburst effect)), and the presence of Codman's triangle (lifting of the periosteum at the periphery of the lesion).…”