General Considerations

•OSA and CSA are the most common scapular tumors

•scapular OSA had a similar biologic behaviour to appendicular OSA

•telangiectatic OSA of the scapula is associated with the highest rate of metastasis

•diagnosis: survey radiographs ± CT

•90% of the scapula can be excised with good to excellent function

Treatment

•partial or total scapulectomy

•lateral recumbency with affected thoracic limb uppermost

•lateral approach to spine of scapula

•trapezius, omotransversarius and rhomboideus muscles dissected close to their origins on the scapula

•acromial and spinous heads of deltoideus dissected close to their origins on the scapula

•deep dissection started dorsally with lateral retraction of scapula and elevation of serratus ventralis muscle

•brachial plexus and axillary artery and vein identified and preserved

•coracobrachialis, teres minor, infraspinatus, supraspinatus, and subscapularis tendons are transected at the humerus

•teres major and long head of the triceps muscles separated from their insertions on the caudal scapula

•osteotomy of glenoid tubercle performed to preserve tendon of origin of the biceps brachialis

•scapula removed with attached infraspinatus, supraspinatus, and subscapularis muscles

•postoperative chemotherapy is recommended for dogs with scapular OSA