User=LacunaeThis glossary term has not yet been described. are multiple well-demarcated round/oval and reddish structuresThis glossary term has not yet been described. arranged in clusters, separated by a white rim called septae. Histologically, they correspond to dilated, thin-walled vesselsThis glossary term has not yet been described. in the papillary dermis. Lacunae are the hallmark of vascular tumors, mainly angiomas. Dark (violaceous, blue-black, or black) lacunae reveal partially or completely thrombosed dermal vessels located deeper in the dermis, which are very specific of solitary angiokeratomas . In targetoid hemosiderotic angiokeratomas a central dark lacunae is surrounded by a peripheral red-brownish homogeneous area. Histopathologically, it reveals the presence of less dilated angulated vascular spaces, hemosiderin deposition and extravasated erythrocytes in the mid and deep dermis 
ReferencesThis is material contained in a footnote or bibliography holding further information.
- Zaballos et al.: DermoscopyThe examination of [skin lesions] with a 'dermatoscope'. This traditionally consists of a magnifier (typically x10), a non-polarised light source, a transparent plate and a liquid medium between the instrument and the skin, and allows inspection of skin lesions unobstructed by skin surface reflections. Modern dermatoscopes dispense with the use of liquid medium and instead use polarised light to cancel out skin surface reflections. of solitary angiokeratomas: a morphological study. Arch Dermatol 2007;143:318-25. PMID: 17372096. DOI.
- Zaballos et al.: Dermoscopy of Targetoid Hemosiderotic HemangiomaThis glossary term has not yet been described.: A Morphological Study of 35 Cases. Dermatology (Basel) 2015;231:339-44. PMID: 26458032. DOI.