Cat with swelling at distal humerus and progressive lameness; next best step?

Cat with swelling at distal humerus and progressive lameness; next best step?

• A. Start antibiotics
• B. Biopsy of the lesion
• C. Recheck radiographs
• D. Limb amputation

Answer: (B)

When a cat has a distal limb bone lesion with worsening lameness, the priority is to obtain a definitive diagnosis before choosing treatment. Imaging can reveal that a lesion exists, but it cannot reliably tell you whether it’s a malignant tumor, infection, or another inflammatory process, nor its exact nature or behavior. A biopsy provides histopathology that confirms what the lesion is and guides subsequent management—whether that’s surgical planning (like amputation or limb-sparing approaches), chemotherapy for a tumor, or antibiotics/drainage if infection is present. Starting antibiotics without evidence of infection won’t address a neoplasm, and simply rechecking radiographs won’t reveal the precise diagnosis. Amputation may be part of treatment, but it should be based on a confirmed diagnosis and staging. So, biopsy of the lesion is the best next step.

When a cat has a distal limb bone lesion with worsening lameness, the priority is to obtain a definitive diagnosis before choosing treatment. Imaging can reveal that a lesion exists, but it cannot reliably tell you whether it’s a malignant tumor, infection, or another inflammatory process, nor its exact nature or behavior. A biopsy provides histopathology that confirms what the lesion is and guides subsequent management—whether that’s surgical planning (like amputation or limb-sparing approaches), chemotherapy for a tumor, or antibiotics/drainage if infection is present. Starting antibiotics without evidence of infection won’t address a neoplasm, and simply rechecking radiographs won’t reveal the precise diagnosis. Amputation may be part of treatment, but it should be based on a confirmed diagnosis and staging. So, biopsy of the lesion is the best next step.