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case_images: Patient with feline congenital hypothyroidism. (A) Wide flat face and short neck with small ears. (B) Note the dull coat and dry seborrhea. (C) Feline at 3 months of age with thickened gingival tissue covering the deciduous incisors (thin black arrow). (D) Feline at 10 months of age undergoing treatment with levothyroxine sodium with improvement of gingival tissue, presence of permanent teeth and retention of lower and upper right primary canine teeth. (E) A large amount of feces prior to treatment in the lateral abdominal X-ray. (F) At 4 months of age, there is late closure of the ossification centers.
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case_images: The animal was rescued with another cat of the same litter (Figure 1A). The radiographic study in the right laterolateral, left laterolateral, and ventrodorsal projections revealed a large accumulation of feces in the colon, corroborating the initial suspicion of constipation (Figure 1E). The radiographic examination revealed a delay in closing the ossification centers, marked epiphyseal lines in the long bones, irregularly formed vertebral bodies, and fecal retention (Figure 1F). However, the patient still had deciduous teeth (upper right and lower right and left canines) and right unilateral cryptorchidism (Figures 1D and 2D).
case_images: (A and B) Note the difference between the patient before treatment, with a lethargic appearance, rounded head and short stature, and after administration of levothyroxine sodium for one year. (C) Evidence of right unilateral cryptorchidism on palpation. (D) Excised testicles on the right through orchiectomy and on the left performed by abdominal laparotomy.
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case_images: The clinical evaluation revealed a weight gain to 2.45 kg during treatment, improvement in the shape of the skull, the presence of permanent teeth, and a notable increase in body size (Figure 2A, 2B, 2C). However, the patient still had deciduous teeth (upper right and lower right and left canines) and right unilateral cryptorchidism (Figures 1D and 2D).
case_images: Thyroid scintigraphy in a 15-month-old cat in ventral and lateral positions. (A) Note that the thyroid lobes are increased in volume and with intense uptake of the radiopharmaceutical when compared to the salivary glands. Note the ectopic thyrodian tissue in the cranial mediastinum region. (B) Normal scintigraphy for comparison purposes only. (C) (D) Result of scintigraphic examination of both enlarged thyroid lobes and ectopic tissue using the pinhole method. The images are consistent with symmetric bilateral thyroid hyperplasia and ectopic thyroid tissue (hypothyroidism due to dyshormonogenesis).
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case_images: Furthermore, ectopic thyroid tissue was observed in the cranial mediastinal region (Figure 3A, 3B, and 3C).