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TUMOUR seeding is the local spread of viable tumour cells as a direct result of an interventional procedure such as surgery or biopsy. Needle tract seeding is an infrequent but well-recognised occurrence in human beings and animals following image-guided fine needle aspiration (FNA), biopsy or radiofrequency ablation of tumours. A wide variety of tumours have been associated with needle tract seeding in human beings, including transitional cell carcinomas, hepatocellular carcinoma, pancreatic carcinoma and non-small cell lung tumours (Kim and others 2003, Kosugi and others 2004, Stigliano and others 2007). Needle tract seeding in veterinary patients has been most often associated with transitional cell carcinoma (Gilson and Stone 1990, Nyland and others 2002, Vignoli and others 2007). This short communication describes a case of a pulmonary adenocarcinoma seeding along a FNA tract in the thoracic wall of a dog.
A seven-year-old female neutered Cairn terrier was referred to the Queen Mother Hospital for Animals for pacemaker implantation to treat sick sinus syndrome. Thoracic radiographs, routine biochemistry and haematology carried out during the course of the investigation and treatment were normal. Six months later, at routine follow-up examination, a mass in the left caudal lung lobe was observed radiographically. This was investigated further by CT (Fig 1) and subsequent ultrasound-guided FNAs. The cytological diagnosis was pulmonary carcinoma. Concurrent abdominal ultrasonography revealed four hepatic nodules, which were biopsied and found on histology to be consistent …