Post-natal development comprises both maturation (from newborn to adult) and ageing (from adult to senility) and, during this phase, several adaptive mechanisms occur in sympathetic ganglia, albeit they are not fully understood. Therefore, the present study aimed at detecting whether post-natal development would exert any effect on the size and number of a guinea pig's superior cervical ganglion (SCG) neurons. Twenty right SCGs from male subjects were used at four ages, i.e. newborn (7 days), young (30 days), adult (7 months) and old animals (50 months). Using design-based stereological methods the volume of ganglion and the total number of mononucleate and binucleate neurons were estimated. Furthermore, the mean perikaryal volume of mononucleate and binucleate neurons was estimated using the vertical nucleator. The main findings of this study were a combination of post-natal-dependent increases and decreases in some variables: (i) 27% increase in ganglion volume, (ii) 24% and 43% decreases in the total number of mono and binucleate neurons, respectively, and (iii) 27.5% and 40% decreases in the mean perikaryal volume of mono and binucleate neurons, respectively. Despite the fall in neuron numbers found here, post-natal development is not only associated with neuron loss, but also embraces other structural adaptive mechanisms, which are discussed in this paper.

ResumoCaracterizou-se retrospectivamente, a partir do ano de 1997 até março de 2008, a ocorrência de casos de leishmaniose, visceral ou tegumentar, dentre os cães dermatopatas atendidos em serviço especializado de hospital-escola veterinário AbstractThe occurrence of visceral or cutaneous canine leishmaniasis cases among dermatophatic dogs admitted to the veterinary teaching hospital School of Veterinary Medicine and Animal Husbandry -University of São Paulo from 1997 to 2008 was retrospectively characterized. For the diagnosis of 427 animals, serological (Enzyme-Linked Immunosorbent Assay, Indirect Immunofluorescence and/or Complement Fixation), parasitological and molecular (Polymerase Chain Reaction) tests were performed, which resulted in 117 (27.4%) confirmed positive cases. Of these, 96 (82.1%) were pure breed dogs and the others 21 (17.9%) were cross breed, being 57 (48.7%) females and 60 (51.3%) males. In terms of age, 26 (22.2%) were younger than 36 months, 48 (41%) were between 36 and 84 months, and 43 (36.8%) were older than seven years old. Sixty-four (54.7%) dogs were considered oligosymptomatic, 44 (37.6%) symptomatic, and the remaining nine (7.7%) asymptomatic. The main clinical findings were, in descending order, dermal lesions, lymphadenopathy, anemia, dysorexia, prostration and splenomegaly. As for hematological disorders, relative and absolute lymphopenia was the most important findings. Ninety-six (82.1%) of the positive animals correspond to allochthonus cases from São Paulo municipality.

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Renal neoplasias are rare in dogs. When these occur, they usually affect middle-aged dogs from medium to large breeds, and most of them with malignant behavior. Only 7-11% of these tumors are of mesenchymal origin. Renal mesenchymal metastases appear most frequently in the lungs and abdominal organs. Clinical signs are non-specific, such as weight loss, inappetence and hematuria. This article describes a case of renal stromal sarcoma in a 7-year-old Rottweiler bitch. The main symptoms were fatigue and prostration. Exams showed anemia and neoplastic lesions in both kidneys, liver and jejunum. Ultrasound-guided fine-needle aspiration was inconclusive. Final diagnosis was achieved port-mortem, through tissue biopsy and immunohistochemistry.