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Twister rat (Rattus norvegicus) belongs to the same taxonomic group as the capybara, agouti and spotted paca and belongs to family Muridae. Rodents have been in close contact with humans for centuries and are prominent species for having a cosmopolitan distribution and for being responsible for most of the economic and health damage caused to human beings. Rodents are migrating from research laboratories to residences, as no conventional pets, due to their graciousness and docility. A twister rat was examined, with a neoformation on the animal's flank. The patient, a 21-month-old female, with gray and white skin and weighing 375 g, presented a neoplasm of firm consistency and located in subcutaneous tissue. The patient was referred to the surgical procedure for removal the neoformation. Objective of the present cientific work is to describe the occurrence of a neoplasm in twister rat, as well discuss the surgical technique and anesthetic protocol used in the patient. [ABSTRACT FROM AUTHOR]

The objective is to report the surgical reintervention for enlarging margins in a patient diagnosed with cutaneous mast cell tumor. A canine, male, French Bulldog, 7 years old, was seen with a history of skin nodule removal in the abdominal region 15 days ago, with a histopathological diagnosis compatible with grade I mastocytoma and compromised surgical margins. Then, it was decided to perform a second surgical procedure to expand the safety margins, which was preceded by planning 5 cm of cutaneous margins and a layer of fascia and a muscular plane as a deep margin, in addition to inguinal lymphadenectomy. During the procedure, synthesis was possible without the use of reconstructive techniques, from the subcutaneous divulsion and the use of the Walking Suture pattern. There were no transoperative complications, and hematoma formation was the only postoperative complication observed. The material was sent for histopathological analysis, confirming low-grade cutaneous mastocytoma with free margins and no evidence of lymph node metastasis. Thus, adjuvant therapies were not instituted, and after 320 postoperative days, the patient was in excellent general condition, with no evidence of recurrence or distant metastases on chest radiography and abdominal ultrasound. It is concluded that surgical reintervention can be an alternative for the treatment of low-grade mastocytoma with compromised margins, and that histopathological diagnosis and surgical planning are essential to reduce trans and postoperative complications, increasing the chances of success and cure of the patient. [ABSTRACT FROM AUTHOR]