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also known as storiform collagenoma&#44; is an uncommon benign tumor&#46; It clinically manifests as a firm&#44; solitary&#44; well-circumscribed&#44; whitish or flesh-colored papule or nodule and typically affects young adults&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> It is preferentially located on the face and extremities&#44; but has also been described on the trunk&#44; scalp&#44; oral mucosa&#44; and nail bed&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> Multiple SFs are considered to be a cutaneous marker of Cowden syndrome&#44;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> unlike solitary lesions&#44; which are not usually observed in this hereditary skin condition&#46; Histopathologic examination shows a well-circumscribed&#44; nonencapsulated&#44; dermal tumor composed of thick hypocellular hyalinized collagen bands separated by numerous clefts and scarce fibroblasts interspersed among the collagen bands&#46; The clefts are randomly arranged and form a storiform pattern at low magnification&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">Two theories have been proposed to explain the etiology and pathogenesis of SF&#46; According to the first theory&#44; SF is a distinct clinical and pathologic entity&#44; which in particular would explain its association with Cowden syndrome&#46; According to the second theory&#44; it would be the end stage of existing lesions&#44; such as dermatofibromas&#44; neurofibromas&#44; angiofibromas&#44; folliculitis&#44; erythema elevatum diutinum&#44; lipomas&#44; fibroma of the tendon sheath&#44; melanocytic nevi&#44; and giant cell collagenomas&#46; The most commonly associated entity is dermatofibroma&#46;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;4</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">A recent dermoscopic study of SF&#44; the first of its kind&#44; described a homogeneous lesion against a white background with peripheral arborizing vessels and a perilesional erythematous halo&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> Our findings were very similar&#46; The following conditions should be contemplated in the differential diagnosis&#58; atypical dermatofibroma&#44; late-stage sclerotic dermatofibroma&#44; basal cell carcinoma&#44; hypomelanotic or amelanotic blue nevus&#44; and amelanotic melanoma&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> Unlike SF&#44; atypical and late-stage sclerotic dermatofibromas usually have a delicate peripheral pigment network&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> Additional dermoscopic features observed in basal cell carcinoma include cartwheel structures&#44; maple leaf&#8211;like areas&#44; ulceration&#44; multiple globules&#44; and blue-gray ovoid nests&#46; Blue nevus and amelanotic melanoma do not always exhibit a residual blue-brownish pigment&#44;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> making them more difficult to distinguish from SF&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">We have presented a new case of SF with very similar dermoscopic findings to those recently described&#46; Although dermoscopy can provide important diagnostic clues&#44; a diagnosis of SF must be histologically confirmed&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Conflicts of Interest</span><p id="par0035" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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Vol. 111. Núm. 9.
Páginas 773-774 (noviembre 2020)
Visitas
8151
Vol. 111. Núm. 9.
Páginas 773-774 (noviembre 2020)
Practical Dermoscopy
Open Access
Solitary Sclerotic Fibroma: Dermoscopic Features
Fibroma esclerótico solitario: características dermatoscópicas
Visitas
8151
N. Setó-Torrenta,
Autor para correspondencia
nurisetorrent@gmail.com

Corresponding author.
, G. Melé-Ninota, M. Quintana-Codinaa, R. Ballester-Victoriab
a Servicio de Dermatología, Hospital Universitari Sagrat Cor, Barcelona, Spain
b Servicio de Anatomía Patológica, Hospital Universitari Sagrat Cor, Barcelona, Spain
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An 89-year-old woman presented with an indurated whitish nodule with superficial vascularization on the fourth finger of her left hand (Fig. 1). The lesion had been present for several years. Dermoscopy (Fig. 2) showed peripheral arborizing vessels against a whitish background and an erythematous halo around the lesion. The lesion was excised and sent for pathologic examination (Fig. 3).

[[?]] What Is Your Diagnosis?

Fig. 1.

Well-demarcated nodule measuring 7 × 5.7 mm with superficial vascularization.

(0.07MB).
Fig. 2.

Homogeneous white lesion with perilesional erythema and peripheral arborizing vessels.

(0.05MB).
Fig. 3.

Abundant hypocellular hyalinized bands of collagen and clefts forming a storiform pattern.

(0.13MB).
Diagnosis

Solitary sclerotic fibroma.

Comment

Sclerotic fibroma (SF), also known as storiform collagenoma, is an uncommon benign tumor. It clinically manifests as a firm, solitary, well-circumscribed, whitish or flesh-colored papule or nodule and typically affects young adults.1 It is preferentially located on the face and extremities, but has also been described on the trunk, scalp, oral mucosa, and nail bed.2 Multiple SFs are considered to be a cutaneous marker of Cowden syndrome,1 unlike solitary lesions, which are not usually observed in this hereditary skin condition. Histopathologic examination shows a well-circumscribed, nonencapsulated, dermal tumor composed of thick hypocellular hyalinized collagen bands separated by numerous clefts and scarce fibroblasts interspersed among the collagen bands. The clefts are randomly arranged and form a storiform pattern at low magnification.1

Two theories have been proposed to explain the etiology and pathogenesis of SF. According to the first theory, SF is a distinct clinical and pathologic entity, which in particular would explain its association with Cowden syndrome. According to the second theory, it would be the end stage of existing lesions, such as dermatofibromas, neurofibromas, angiofibromas, folliculitis, erythema elevatum diutinum, lipomas, fibroma of the tendon sheath, melanocytic nevi, and giant cell collagenomas. The most commonly associated entity is dermatofibroma.3,4

A recent dermoscopic study of SF, the first of its kind, described a homogeneous lesion against a white background with peripheral arborizing vessels and a perilesional erythematous halo.2 Our findings were very similar. The following conditions should be contemplated in the differential diagnosis: atypical dermatofibroma, late-stage sclerotic dermatofibroma, basal cell carcinoma, hypomelanotic or amelanotic blue nevus, and amelanotic melanoma.2 Unlike SF, atypical and late-stage sclerotic dermatofibromas usually have a delicate peripheral pigment network.5 Additional dermoscopic features observed in basal cell carcinoma include cartwheel structures, maple leaf–like areas, ulceration, multiple globules, and blue-gray ovoid nests. Blue nevus and amelanotic melanoma do not always exhibit a residual blue-brownish pigment,6 making them more difficult to distinguish from SF.

We have presented a new case of SF with very similar dermoscopic findings to those recently described. Although dermoscopy can provide important diagnostic clues, a diagnosis of SF must be histologically confirmed.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

References
[1]
M.J. Izquierdo, M.A. Pastor, L. Carrasco, C. Requena, M.L. Soguero, C. Moreno, et al.
Fibroma esclerótico con células gigantes multinucleadas.
Actas Dermosifiliogr, 92 (2001), pp. 419-421
[2]
M. Ebadian, L. Citarella, D. Collins, Lewisham and Greenwich NHS Trust, et al.
Dermoscopy of a solitary storiform collagenoma.
Dermatol Pract Concept, 8 (2018), pp. 120-122
[3]
W.A. High, D. Stewart, L.R. Essary, N.P. Kageyama, M.P. Hoang, C.J. Cockerell.
Sclerotic fibroma-like change in various neoplastic and inflammatory skin lesions: is sclerotic fibroma a distinct entity?.
[4]
O. Abbas, S. Ghosn, R. Bahhady, S. Salman.
Solitary sclerotic fibroma on the scalp of a young girl: reactive sclerosis pattern?.
J Dermatol, 37 (2010), pp. 575-577
[5]
V. Coelho de Sousa, A. Oliveira.
Nodular lesion with polymorphous vascular pattern.
Dermatol Pract Concept, 7 (2017), pp. 81-83
[6]
C. Ma, C.J. Chambers, M. Kiuru, D.K. Marsee, M. Silverstein.
Amelanotic blue nevus.
JAAD Case Reports, 3 (2017), pp. 93-94

Please cite this article as: Setó-Torrent N, Melé-Ninot G, Quintana-Codina M, Ballester-Victoria R. Fibroma esclerótico solitario: características dermatoscópicas. Actas Dermosifiliogr. 2020. https://doi.org/10.1016/j.ad.2020.05.005

Copyright © 2020. AEDV
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