PMC5359794_01
Postcontrast (a) axial and (b) dorsal images acquired utilising 0.8 mm slice collimation computed tomography at the level of the cranial pole of the left kidney. These images have been reconstructed using a maximum-intensity projection technique with OsiriX software (v.6.1.1.64-bit; Pixmeo Sarl). There is a 2.4 cm (width) x 3 cm (height) x 3.2 cm contrast-enhancing left adrenal mass. The mass is located immediately caudal to the renal artery and adjacent to the vena cava. There is no evidence of invasion into the adjacent vessels. The right adrenal gland cannot be visualised in these images
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The cat underwent computed tomography (CT) of the abdomen, thorax and skull under general anaesthesia (Figure 1).
T2-weighted (a) parasagittal, (b) dorsal and (c) axial, and T1-weighted precontrast (d) axial and (e) fluid attenuation inversion recovery (FLAIR) axial 4 mm thickness magnetic resonance images. There is a 2 cm x 1.5 cm well-demarcated mass lesion with a broad base towards the periphery within the left parietal brain lobe (thick arrow). There is evidence of midline shift and impingement of the left lateral ventricle (thin arrow). The mass is isointense to grey matter in the T1-weighted sequences and hyperintense in T2-weighted and FLAIR sequences. The mass is consistent with a meningioma with evidence of increased intracranial pressure.
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Meningioma was suspected and magnetic resonance imaging (MRI) was performed to further characterise the lesion and to confirm that the tumour was solitary, prior to surgical excision (Figure 2).
(a) Meningioma resected via a rostrotentorial craniotomy. (b) Cut surface of the resected adrenocortical adenocarcinoma
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After stabilisation, the intracranial mass was removed 3 days later via a rostrotentorial craniotomy with no complications (Figure 3).
Photomicrograph of meningioma tissue (a) after immunohistochemical staining for progesterone receptors (PRs). Note the positive labelling of most nuclei compared with the relative absence of labelling with the negative antibody control (b). (c) PRs are present within the positive antibody control (mammary adenocarcinoma tissue). Immunohistochemistry was performed using a mouse monoclonal antibody to PRs (Bio-Genex Insite PR antibody [Clone PR88]; Bio-Genex) and the peroxidise method with 3,3'-diaminobenzidine chromagen and a light haematoxylin counterstain
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There was strong positive labelling of PRs in the meningioma tissue (Figure 4).