[Ultrasonographic findings in a cow with extraskeletal chondroblastic osteosarcoma of the neck region]. / Ultraschallbefunde bei einer Kuh mit extraskelettalem chondroblastischem Osteosarkom am Hals.

This case report describes the clinical, ultrasonographic and pathological findings in a five-year-old Swiss Braunvieh cow with extraskeletal chondroblastic osteosarcoma of the neck region. The cow was referred because of a firm, non-painful swelling, approximately 25 cm in diameter, which was situated mainly on the lower left side of the neck but extended to the right. Ultrasonographic examination of the mass revealed a chambered structure containing echoic material that was separated by hyperechoic septa. Chondroblastic osteosarcoma was diagnosed based on histological evaluation of a biopsy sample, and the diagnosis was confirmed by postmortem examination.