Reflected light microscopy, intralesional vascular aneurysms and blood lakes

Author: Prof. Dr. med. Peter Altmeyer

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Last updated on: 29.10.2020

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intralesional aneurysmatic vessels and blood lakes

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Within a skin lesion aneurysmatic dilatation of horizontal blood vessels and oval hemorrhagic foci not visible to the naked eye.

General information
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  • Reflected light microscopy: Single, circumscribed or diffusely arranged, horizontally running blood vessels within the lesion with strong variations in calibre, aneurysmatic sacculations, vascular polymorphies and blood leaks. Oval blood lakes and thrombus formation. In whitish opaque connective tissue tumor replacement structures and amelanotic melanomas, the capillaries altered in this way are particularly numerous.

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Among the melanocytic skin tumors in more than 30% of malignant melanomas with a penetration depth of Clark Level IV.

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  3. Kreusch JF (2003) Vascularization patterns of pigmented and non-pigmented skin tumors. In: Blum A, Kreusch JF, Bauer J, Garbe C (Hrsg) Dermatoscopy of skin tumors. Steinkopff, Darmstadt, S. 59-66
  4. Schulz H (1992) Angiectatic structural elements of benign and malignant pigment cell tumors in reflected light microscopy. Act Dermatol 18: 295-298


Last updated on: 29.10.2020