Intracranial arachnoid cysts in a chimpanzee (Pan troglodytes).
An intracranial arachnoid cyst was detected in a 32-year-old, 44.6-kg, female chimpanzee at the Primate Research Institute, Kyoto University. Magnetic resonance imaging (MRI) and computed tomography (CT) were performed and the cognitive studies in which she participated were reviewed. MRI revealed that the cyst was present in the chimpanzee's right occipital convexity, and was located in close proximity to the posterior horn of the right lateral ventricle without ventriculomegaly. CT confirmed the presence of the cyst and no apparent signs indicating previous skull fractures were found. The thickness of the mandible was asymmetrical, whereas the temporomandibular joints and dentition were symmetrical. She showed no abnormalities in various cognitive studies since she was 3 years old, except a different behavioural pattern during a recent study, indicating a possible visual field defect. Detailed cognitive studies, long-term observation of her physical condition and follow-up MRI will be continued.
Primate Research Institute, Kyoto University, 41-2 Kanrin, Inuyama, Aichi, 484-8506, Japan.
Takako
T
Miyabe-Nishiwaki
Takaaki
T
Kaneko
Tomoko
T
Sakai
Akihisa
A
Kaneko
Akino
A
Watanabe
Shohei
S
Watanabe
Norihiko
N
Maeda
Kiyonori
K
Kumazaki
Juri
J
Suzuki
Reina
R
Fujiwara
Haruyuki
H
Makishima
Takeshi
T
Nishimura
Misato
M
Hayashi
Masaki
M
Tomonaga
Tetsuro
T
Matsuzawa
Akichika
A
Mikami
D000818:Animals; D000836:Animals, Zoo; D018420:Ape Diseases / Q000175:diagnosis* / Q000473:pathology / Q000503:physiopathology; D016080:Arachnoid Cysts / Q000175:diagnosis / Q000473:pathology / Q000503:physiopathology / Q000662:veterinary*; D003071:Cognition; D005260:Female; D007564:Japan; D008279:Magnetic Resonance Imaging; D002679:Pan troglodytes; D014057:Tomography, X-Ray Computed