Hobnail (Targetoid Hemosiderotic) Hemangioma


Hobnail Hemangioma
Low-magnification view of a hobnail hemangioma (HH) demonstrates superficial dilated vascular spaces image in the papillary dermis with deeper small blood vessels and stromal hemosiderin deposits image.



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Higher Magnification of Superficial HH
Higher power examination of the superficial portion of an HH shows superficial dilated vessels lined by small endothelial cells with nuclear hyperchromasia protruding into the lumina image.

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Deeper Vessels and Hemosiderin Deposits in HH
Histologic examination of the deeper aspect of the lesion shows small, thin-walled blood vessels image and prominent hemosiderin deposition in the stroma image.

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More Cellular Example of HH
This is an example of a more cellular HH composed of many closely apposed vessels in the superficial dermis, many of which show very small, compressed lumens image. Hobnailed endothelial cells can be appreciated in some of the vessels image.


TERMINOLOGY


Abbreviations




• Hobnail hemangioma (HH)


Synonyms




• Targetoid hemosiderotic hemangioma (clinical term)


Definitions




• Benign vascular proliferation, typically wedge-shaped, showing intravascular papillae and hobnailed endothelial cells


ETIOLOGY/PATHOGENESIS


Unknown




• Trauma has been implicated in some cases
image Postulated to represent traumatized lymphangioma or hemangioma


CLINICAL ISSUES


Epidemiology




• Incidence
image Uncommon tumors

• Age
image Young to middle-aged adults

• Sex
image More common in males


Site




• Typically present on lower extremities; also may occur on upper extremities, rarely in oral cavity


Presentation




• Skin papule or nodule
image Often pigmented due to hemosiderin deposition

image May show halo (targetoid appearance) in minority of cases

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Apr 24, 2017 | Posted by in PATHOLOGY & LABORATORY MEDICINE | Comments Off on Hobnail (Targetoid Hemosiderotic) Hemangioma

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