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Dermoscopic findings of haemosiderotic and aneurysmal dermatofibroma:
report of six patients.Br
J Dermatol. 2006 Feb;154(2):244-50.
BACKGROUND: The
clinical diagnosis of dermatofibroma is commonly easy. However, the
differentiation of dermatofibroma from other cutaneous tumours is
difficult in some instances, primarily in atypical cases and rare
variants. Haemosiderotic dermatofibroma is a variant composed of
numerous small vessels, extravasated erythrocytes and intra- and
extracellular haemosiderin deposits. Aneurysmal dermatofibroma is a
variant composed of large, blood-filled spaces without endothelial
lining. Some authors consider that haemosiderotic dermatofibroma is
an early stage in the development of aneurysmal dermatofibroma. The
clinical differential diagnosis of haemosiderotic or aneurysmal
dermatofibroma must include melanoma and other melanocytic tumours,
vascular neoplasms, adnexal tumours and nonspecific cysts.
Dermoscopy improves the diagnostic accuracy in pigmented and
nonpigmented skin lesions. OBJECTIVES: To evaluate specific
dermoscopic criteria. METHODS: Dermoscopic examination (using the
DermLite Foto; 3Gen, LLC, Dana Point, CA, U.S.A.) of six patients
with haemosiderotic or aneurysmal dermatofibromas was performed to
evaluate specific dermoscopic criteria. RESULTS: A multicomponent
pattern with a central bluish or reddish homogeneous area in
combination with white structures and a peripheral delicate pigment
network along with vascular structures was noted in five of six
lesions. CONCLUSIONS: This dermoscopic pattern yielded the diagnosis
of haemosiderotic or aneurysmal dermatofibroma in most cases.
However, this multicomponent pattern may present in some melanomas
and although it is useful in determining a clinical diagnosis of
aneurysmal dermatofibroma, it may not be specific to this entity. |
