PMC7521566_01
The kidneys had multifocal dark red, fluid-filled cysts (arrows) that form upon palpation and are observable from the renal capsule. The left kidney was more distended and rounded at the renal capsule
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Fig1
The post-mortem findings showed the cat had a poor body condition, oral ulceration, abdominal serous fat atrophy, thoracic effusion, fibrinopleuropneumonia, pulmonary oedema, tracheitis, pericardial effusion, left ventricular hypertrophy and right ventricular dilation, chronic passive liver congestion, splenic contraction, mesenteric lymphadenomegaly, intestinal haemorrhage, adrenomegaly and polycystic kidney (Figs. 1 and 2).
Upon dissecting, yellowish fluid oozed out from the cyst and there were multiple irregular border cysts (arrows)
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Fig2
The post-mortem findings showed the cat had a poor body condition, oral ulceration, abdominal serous fat atrophy, thoracic effusion, fibrinopleuropneumonia, pulmonary oedema, tracheitis, pericardial effusion, left ventricular hypertrophy and right ventricular dilation, chronic passive liver congestion, splenic contraction, mesenteric lymphadenomegaly, intestinal haemorrhage, adrenomegaly and polycystic kidney (Figs. 1 and 2).
Presence of multiple homogenous fluid-filled cysts (arrows) in the renal parenchyma and loss of renal parenchyma structural details (solid arrow) (2 x). Haematoxylin and eosin. Barr = 1000 mum
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Fig3
The kidney tissue showed multiple cysts with homogenous fluid in the renal parenchyma and diffused loss of renal structural details due to the presence of space-occupying cysts (Fig. 3).
The cyst was lined by a single layer of squamous epithelial cell (arrow) (10 x); haematoxylin and eosin. Barr = 100 mum
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Fig4
The cysts were lined by a single layer of epithelial cells (Fig. 4).
Some squamous epithelial cells (arrow) of the cyst are necrotised due to pressure necrosis (20 x). Haematoxylin and eosin. Barr = 50 mum
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Fig5
Some of the epithelial cells had sloughed off into the lumen while some had undergone karyolytic necrosis due to pressure necrosis (Fig. 5).
The renal tubular epithelial cells underwent pyknosis (arrowhead) and karyolysis (arrow) while some tubular cells had undergone hydropic degeneration (solid arrow) (40 x). Haematoxylin and eosin. Barr = 20 mum
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Fig6
The renal tubular epithelial cells showed pyknosis and karyolysis and some renal tubular cells showed hydropic degeneration, causing the swelling of the cells (Fig. 6).