Gender: Female Spayed
Patient has had swelling and discharge on the third digit on the right pelvic limb with the nail missing for several months. Patient has not responded to antibiotics and recent lab work at Idexx showed NSF. There was osteolysis on radiographs. Patient has a similar lesion on the third digit on the left thoracic pay. Digits have been amputated.
Excision: Completely removed, proximal soft tissue margin 10 mm, interdigital margin 1 mm, proximal bone margin 20 mm
Vascular Invasion: Not observed
It is unlikely that this is a primary adenocarcinoma arising from apocrine glands in this region, although this is a possibility. Metastatic adenocarcinoma, probably from a pulmonary tumor is suspected. The patient should be evaluated for neoplasia in the lungs.
Primary lung tumors in cats can metastasize to the digits. Particularly bronchial and bronchioloalveolar adenocarcinoma. Weight-bearing digits are the most frequently affected and MULTIPLE DIGITS OR MULTIPLE LIMBS can be involved. Clinical signs from the primary tumor in the thoracic cavity may not be detected and the digital mass may be the first indication of neoplasia. Lung tumors may also metastasize to the skin, eyes, skeletal muscle and bone as well as thoracic and abdominal organs.
- Low magnification view of the lesion (as submitted), demonstrating infiltrative acinar type structures.
- Higher magnification view of the lesion (5X), demonstrating numerous acinar structures within the dermis.
Higher magnification view of the lesion (20X), demonstrating numerous acinar structures within the dermis comprised of cuboidal to columnar epithelial cells.