HistoryA 31-year-old 7.5-kg (16.5-lb) vasectomized male black-handed spider monkey (Ateles geoffroyi) from a zoological collection was evaluated as part of a routine physical examination. The monkey was reported to be in good health, with normal behavior observed, aside from occasional episodes of hyporexia that would resolve without treatment. Findings on physical examination were unremarkable with the exception of several large, hard structures palpated in the caudal aspect of the abdomen. Findings on CBC and serum biochemical analysis were within reference range. The patient was anesthetized with ketamine (5.3 mg/kg [2.4 mg/lb], IM), dexmedetomidine (0.026 mg/kg [0.012 mg/lb], IM), and midazolam (0.1 mg/kg [0.045 mg/lb], IM), then intubated and maintained under anesthesia with isoflurane in oxygen. A palpation-guided fine-needle aspirate was obtained from one of structures. It felt as though the needle were unable to penetrate the structure' s surface. Cytologic evaluation revealed a bacterial population consistent with that of the large intestinal tract as well as some plant and mineral material. Bacteriologic culture of the aspirated material was negative for Mycobacterium organisms. During the same anesthetic episode, CT was performed of the chest and abdomen (Figure 1).Determine whether additional imaging studies are required, or make your diagnosis from Figure 1-then turn the page → Figure 1-Reconstructed axial (A) and sagittal (B) CT images (bone sharp algorithm; window width, 2,500 Hounsfield units [HU]; window level, 300 HU; slice thickness, 1 mm) of the thorax and abdomen of a 31-year-old male black-handed spider monkey (Ateles geoffroyi) with several hard structures noted on abdominal palpation. Planes of reconstructed CT images are indicated by dashed line.
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