The answer to the given question is “Berry aneurysm”

⏩On Microscopic Examination using Verhoeff van Gieson (VVG) stain:

✅Beyond the neck of the aneurysm, the muscular wall and intimal elastic lamina are absent

✅Aneurysm sac is lined only by thickened hyalinized intima

✅The adventitia covering the sac is continuous with that of the parent artery

✅Rupture usually occurs at the apex of the sac,releasing blood into the subarachnoid space, the substance of the brain, or both

⏩The above picture shows:

✅Blue arrow shows retention of elastic fibers and Red arrow shows loss of elastic fibers (VVG stain)

✅Black arrows show Attenuation and loss of elastica at “mouth” of Berry aneurysm

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