Feline Metastatic Lung Disease Study Guide

Overview and Clinical Importance

Metastatic lung disease is more common than primary lung tumors in cats. This condition occurs when malignant cells from a primary tumor elsewhere in the body spread to the pulmonary parenchyma via hematogenous, lymphatic, or transpleural routes. Understanding this disease is critical for NAVLE success because it involves diagnostic imaging interpretation, prognosis assessment, and treatment decision-making.

Feline pulmonary metastasis presents unique clinical challenges due to cats' tendency to hide clinical signs until disease is advanced. Additionally, cats exhibit a unique syndrome called lung-digit syndrome (also known as feline MODAL syndrome - Muscles, Ocular structures, Digits, Aorta, Limbs) where primary pulmonary carcinomas metastasize to unusual locations, particularly the digits.

Etiology and Pathophysiology

Primary Tumors That Commonly Metastasize to Feline Lungs

The lungs receive the entire cardiac output and have an extensive capillary network, making them a common site for tumor emboli to lodge and establish metastatic foci. In cats, the following tumors most commonly metastasize to the lungs: