Tumours of the perianal region

image of Tumours of the perianal region
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Almost any tumour can affect the tissues of the perianal area, including lymphoma, soft tissue sarcomas, rhabdomyosarcomas, squamous cell carcinoma, melanoma and mast cell tumours. This chapter looks at tumour types and behaviour, presentation and clinical signs; clinical approach; management; prognosis.

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15.31 Circumanal gland tumours are typically sessile masses arising from anywhere in the cutaneous zone of the anus.
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15.32 Anal sac adenocarcinomas can be very large. Paper strips have been used to outline the size of the mass on this dog.
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15.33 This fine-needle aspirate from the mass in Figure 15.32 shows that this is an epithelial tumour with obvious features of malignancy. (Diff-Quik, original magnification X40)
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15.36 Although radiographs of the sublumbar spine are not always sensitive enough to reveal the full extent of lymph node involvement, these two radiographs both show obvious lymph node enlargement.
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15.37 Although not an essential diagnostic tool, coaxial imaging can provide very detailed information on the extent and discreteness of the metastatic burden. This computed tomography ‘slice’ reveals a large cluster of lymph node enlargements about the iliac bifurcation.
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15.38 Thoracic metastasis detected radiographically in a dog with anal sac apocrine adenocarcinoma.
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15.39 Surgical management of the anal sac mass requires gentle excision about the infiltrative border of the mass, taking care not to damage remaining anal sphincter muscle, neural elements and the rectal wall.
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15.40 Removal of sublumbar lymph node deposits requires careful dissection of the lymph node swellings from the sublumbar fascia. The median iliacartery is visible towards the bottom of the surgical field. The suction tip is sitting on top of the enlarged lymph node.
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