PMC6476904_01
Findings of preoperative magnetic resonance imaging of the brain in a female mixed-breed dog with a suprapituitary ependymal cyst. (A-C) T2-weighted images in the sagittal (A), transverse (B), and dorsal (C) planes. (D) A fluid-attenuated inversion recovery image in the transverse plane. The red arrows show the fluid-filled cyst.
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F1
An intra- and suprasellar mass was observed on MRI (Figure 1).
(A,B) Findings of post-operative magnetic resonance imaging of the brain in a female mixed-breed dog with a suprapituitary ependymal cyst managed via endoscopic transsphenoidal surgery. (A) Sagittal and (B) transverse T2-weighted images obtained 1 day after surgery. The images show removal of the hypophysis and complete drainage of the cyst (red arrows pointing to the empty cyst). (C,D) T2-weighted images obtained 73 days after surgery. Orange arrows pointing to the refilled cyst.
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F2
T2W fast spin echo images in the transverse (TE/TR, 83.3/3,920 ms; SL, 3 mm) and sagittal (TE/TR, 96.5/4,500 ms; SL, 3 mm) planes; T2W fluid-attenuated inversion recovery images in the dorsal plane (TE/TR, 127.4/8,002 ms; SL, 3 mm); T2W gradient recalled echo images in the horizontal plane (TE/TR, 20/620); T1-weighted spin echo images in the sagittal plane (TE/TR, 15/240 ms; SL, 2 mm); post-contrast images (0.2 mL/bwkg; Dotarem 0.05 mmol/l injection, Guerbet, Villepinte, France); and three-dimensional T1W images (magnetization prepared rapid gradient-echo) in the sagittal, transverse, and dorsal planes. The sella turcica and cyst were both empty, although the cyst walls showed contrast enhancement on post-contrast images (Figures 2A,B). Regrowth of the cyst to its original size was apparent on MRI, and was compressing the surrounding structures (Figures 2C,D).
Histopathological analysis of a transverse section obtained during necropsy from the midthalamic region of the formalin-fixed brain of a female mixed-breed dog with a recurrent suprapituitary ependymal cyst. The arrow show the location of the cyst.
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F3
Macroscopically, the location of the cyst was accurately identified on the formalin-fixed brain ex situ (Figure 3).