Clinical features, treatment, and outcome in goats with thymomas: 13 cases (1990-2014)

OBJECTIVE To determine the anatomic location and clinical signs of thymoma in goats and long-term outcomes in a subset of goats treated by tumor excision. DESIGN Retrospective case series. ANIMALS 13 goats with a histologic diagnosis of thymoma at the Cornell University Hospital for Animals between 1990 and 2014. PROCEDURES Medical records of goats with thymoma were reviewed and data were evaluated regarding signalment, clinical signs, diagnostic imaging results, thymoma size, treatment, and outcome. Follow-up information was obtained via contact with the owners and review of medical records. RESULTS 8 goats had a mediastinal mass, 4 had a palpable ventral cervical mass, and 1 had both types of masses. Median age at the time of diagnosis was 9.5 years (range, 3 to 12 years). Goats with a mediastinal mass had respiratory distress or marked tachypnea. Six goats were treated surgically, including all 5 with a ventral cervical mass. All 5 goats with a ventral cervical mass survived with no tumor recurrence for ≥ 1 year after excision. Only 2 goats with a mediastinal mass survived to hospital discharge. CONCLUSIONS AND CLINICAL RELEVANCE Results suggested that the prognosis for goats following excision of ventral cervical thymomas was favorable, whereas goats with mediastinal thymomas appeared more likely to have severe clinical signs and a guarded prognosis.