Congenital fibroblastic connective tissue nevi: Unusual and misleading presentations in three infantile cases.

Abstract:

BACKGROUND:Fibroblastic connective tissue nevi (FCTN) are benign skin conditions characterized by bland spindle cells infiltrating the reticular dermis and the upper subcutis with preservation of adnexal structures. A subset of FCTN expresses CD34, which may cause difficulties in the differential diagnosis, in particular with dermatofibrosarcoma (DFSP). We aim to study clinical and histological main features of congenital FCTN to better understand their heterogeneity. METHODS:We present 3 cases of congenital FCTN with misleading pseudo-tumoral presentations and compare them with published cases in literature. We provide a diagnostic algorithm for congenital neonatal connective tissue tumors. RESULTS:Clinically, FCTN mostly present as well-limited and nontender plaques or nodules mainly located in the neck and face areas or in the trunk. Histologically, FCTN are composed of irregularly distributed fascicles of bland spindled cells and are defined by a list of fundamental features: (i) no atypia, pleomorphism, or mitotic activity; (ii) skin appendages entrapped but unaffected; (iii) no evidence for malignancy. In most cases CD34 is positive, but in some cases, cells can express SMA or are even CD34- and SMA-. CONCLUSION:The initial presentation and natural history of FCTN fit better with a neoplasm than with a hamartoma. Thus, we suggest replacing the term "nevus" with tumor and considering fibroblastic connective tissue tumor (FCTT) as the right denomination of this clinico-pathological entity. FCTTs are difficult to diagnose due to their clinical heterogeneity. Clinical and histological malignant and benign differential diagnoses are discussed.

journal_name

Pediatr Dermatol

journal_title

Pediatric dermatology

authors

Bouaoud J,Fraitag S,Soupre V,Mitrofanoff M,Boccara O,Galliot C,Bodemer C,Picard A,Khonsari RH

doi

10.1111/pde.13571

subject

Has Abstract

pub_date

2018-09-01 00:00:00

pages

644-650

issue

5

eissn

0736-8046

issn

1525-1470

journal_volume

35

pub_type

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