Diagnosis and Surgical Treatment of a Chiari I-like Malformation in an African Lion (Panthera leo)
Abstract
A 13-month-old intact male African lion (Panthera leo) presented with a 3-month history of lethargy, ventral flexion of the neck, abnormal vocalization, and ataxia. Hemogram and serum biochemistries were within normal limits except hypokalemia (2.7 mEq/L) and hypochloridemia (108 mEq/L).5 When no improvement was noted with oral potassium gluconate supplementation, a computed tomography scan was performed of the brain and skull and no abnormalities were noted. However, magnetic resonance imaging detected occipital bone thickening, crowding of the caudal cranial fossa with cerebellar compression and herniation, and cervical syringohydromyelia which was consistent with a Chiari I-like malformation. Foramen magnum decompression was performed to relieve the compression of the cerebellum. The animal recovered well, with subsequent resolution of clinical signs. Hypovitaminosis A has been proposed previously as the underlying etiology for this malformation in lions with similar clinical presentations.1-4,6,7 This lion’s serum and liver vitamin A concentrations were low (100 ng/ml and 25.31 μg/g, respectively) as compared to concentrations reported for domestic carnivores and suggest hypovitaminosis A as the underlying cause of this animal’s Chiari I-like malformation.
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