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It's covered with white adipose tissue and it is smooth with reddish brown colour. HE dyed with dimensions 3 cm long and 1 cm wide. I'm guessing that this is a rare thing because I already checked pubmed etc. On the right is a closer picture of the tissue.

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    $\begingroup$ You added that it is rare - what if it is actually very very normal? (where did you get the images from?) $\endgroup$ – Bryan Krause Apr 27 '17 at 21:20
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    $\begingroup$ It's the whole structure and this is not a homework. I saw this on webmicroscope and got really interested. I have been looking kidney histology articles and books and I have hard time figuring out what are these since i'm not studying medicine. Smooth structure made me think it could be multilocular cyst but i'm not sure and the sice of these is huge in kidneys. $\endgroup$ – Katariina J. Apr 27 '17 at 21:42
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    $\begingroup$ Ok...hint: it's a gland. (and it's very normal to have these particular glands on your kidneys..) $\endgroup$ – Bryan Krause Apr 27 '17 at 22:00
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    $\begingroup$ @BryanKrause Please post an answer! $\endgroup$ – canadianer Apr 28 '17 at 22:36
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    $\begingroup$ @canadianer Done. I like these IDs better than species IDs, those are too hard for me :-P $\endgroup$ – Bryan Krause Apr 28 '17 at 23:25
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This is a slice of an adrenal gland:

Adrenal gland

Source (Creative Commons Attribution-Noncommercial-Share Alike 3.0 License): http://histology.medicine.umich.edu/resources/endocrine-system

These glands sit on top of the kidneys, typically under adipose tissue (which can also be seen in both your image and the image I included here). The most identifying feature of the adrenal gland is its clear separation into two parts: the outer "cortex" and inner "medulla", as labeled on the image.

The two parts have different endocrine functions: the cortex primarily produces steroid hormones, like aldosterone and cortisol, whereas the medulla makes catecholamines epinephrine and norepinephrine (also called adrenaline and noradrenaline). I believe the inset in your image is of the medulla.

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