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Net Letter
87 (
4
); 601-601
doi:
10.25259/IJDVL_1013_20

A rare case of infantile desmoid-type fibromatosis on the thigh

Department of Dermatology, The second Xiangya Hospital of Central South University, Changsha, Hunan, China,
Hematopathology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA

Corresponding author: Prof. Guiying Zhang, No. 139 Renmin Road, Changsha 410011, Hunan, China. zgylinda@csu.edu.cn

Licence
This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-Share Alike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as the author is credited and the new creations are licensed under the identical terms.

How to cite this article: Luo S, Tang G, Zhanga G. A rare case of infantile desmoid-type fibromatosis on the thigh. Indian J Dermatol Venereol Leprol 2021;87:601.

Desmoid-type fibromatosis is an uncommon group of fibrous neoplasms which originate from musculoaponeurotic tissues. It accounts for <3% of all soft-tissue tumors and 0.03% of all neoplasms.1 The annual incidence is about 2–4 cases/million with two peaks in 6–15 and 25–35-years-old.2 Desmoid-type fibromatosis occurring before ten years old is also called infantile fibromatosis which have the predilection sites in head, neck, thigh and shoulder.3 Herein, we described a rare case of infantile desmoid-type fibromatosis on the right thigh of an eight month boy.

An eight month-old Chinese boy presented with a dark red plaque on his right thigh at birth. This boy had a natural delivery without history of asphyxiation and birth trauma. There was no significant family history or genetic history. Because there were no other associated symptoms, this patient did not seek medical help eight months when the plaque enlarged gradually. Physical examination revealed a large dark red plaque on the root of his right thigh measuring 5.0 × 8.0 × 0.3 cm, and the surface of the lesion was rough with a red halo around it [Figure 1]. Ultrasonography showed soft-tissue mass involving the dermis and the subcutaneous tissue. Skin biopsy showed a diffused dense infiltration of spindle cells with round or spindle nuclei, arranged in fascicular and storiform pattern [Figure 2a]. Mitotic figures were occasionally seen in high power field without atypicality. At the periphery of the lesion, lymphocytes, histiocytes and occasional multinucleated giant cells infiltration were seen [Figure 2b]. Immunohistochemical staining showed positive for β-catenin [Figure 2c] and negative for desmin, smooth muscle actin and CD34. These findings suggested a diagnosis of desmoid-type fibromatosis. Subsequently, the patient had an extended excision of the skin lesion with negative margins. Post-operative monitoring and magnetic resonance imaging (MRI) scan did not show evidence of recurrence after two years follow-up.

Clinical features: A dark red plaque on the right thigh
Figure 1:
Clinical features: A dark red plaque on the right thigh
Histological findings of the tumor. The tumor cells are in fascicular and storiform pattern without capsule at low-power view (H and E, ×100)
Figure 2a:
Histological findings of the tumor. The tumor cells are in fascicular and storiform pattern without capsule at low-power view (H and E, ×100)
Histological findings of the tumor. The tumor is composed of an admixture of plump spindle cells with round or spindle nuclei in a background of variably hyalinized and myxoid collagenous stroma with occasional mitotic figures at high-power view (H and E, ×400)
Figure 2b:
Histological findings of the tumor. The tumor is composed of an admixture of plump spindle cells with round or spindle nuclei in a background of variably hyalinized and myxoid collagenous stroma with occasional mitotic figures at high-power view (H and E, ×400)
Histological findings of the tumor. Immunohistochemical staining stain shows that the tumor cells are positive for β-catenin (β-catenin staining, ×400)
Figure 2c:
Histological findings of the tumor. Immunohistochemical staining stain shows that the tumor cells are positive for β-catenin (β-catenin staining, ×400)

Desmoid-type fibromatosis was first named by Muller in year of 1838 and regarded as a subtype of locally aggressive fibromatosis which is characterized by nonmetastasis, infiltrative growth and local recurrence.1 These unique characteristics make it a challenge in clinical diagnosis and management.1 Multiple factors including genetic abnormalities, abnormal growth regulation of connective tissue and endocrine have been confirmed to play roles in the pathogenesis of desmoid-type fibromatosis.4 Molecular studies have found that mutations in CTNNB1, the gene encoding β-catenin, are seen in approximately 85% of sporadic cases and overactivation of the Wnt/APC/β-catenin pathway contributes to neoplasia and development of fibrous tissue.5

Desmoid-type fibromatosis generally presents with a slowly growing skin lump with or without pain.6 Biological behavior is often unpredictable although some lesions may behave more aggressively. Desmoid-type fibromatosis was rarely reported to metastasize or undergo sarcomatous transformation, but local spontaneous recurrence is common.6 The histopathological features of desmoid-type fibromatosis are characterized by proliferation of uniformly spindle cells with abundant collagen. Immature mesenchymal-like cells and fibroid hyperplasia can be seen with minimal nuclear atypia.7,8 Immunohistochemical stains are helpful and should be perform in every case. Immunohistochemical staining usually show positive for actin and negative or focally positive for desmin. Positive β-catenin in nuclear staining would be helpful in diagnosis.7,8

Several fibrous tumors should be considered in the differential diagnosis of desmoid-type fibromatosis, especially fibrosarcoma and low-grade myofibroblastic sarcoma. Fibrosarcoma is a malignant tumor characterized by prominent abnormal mitotic activity and typically a herring-bone pattern. Low-grade myofibroblastic sarcoma is a rare type of malignant myofibroblastic tumor which composed of fascicles of cells with vesicular nuclei and indistinct cytoplasmic margins. Fibrosarcoma and low-grade myofibroblastic sarcoma tend to be negative for β-catenin. In some cases, multicentric desmoid-type fibromatosis may be skin feature of Gardner’s syndrome.9 Gardner’s syndrome is an inherited condition also accompanied with familial adenomatous polyposis, and CTNNB1 sequencing might be helpful to screen and identify some difficult cases in children.10

In terms of treatment, expanded resection is the first choice.2,3,6,11 Microscopic positive margins may be acceptable if achieving negative margins would result in greater morbidity. If incomplete resection is performed, the local recurrence rate could be high up to 65%.2,3 MRI scan is helpful to decide the boundaries of the tumor. Recurrence is most likely happening in the 1st year, so long-term clinical and MRI follow-up after surgery are recommended in pediatric patients for early detection of tumor recurrence.3,4,11

In summary, desmoid-type fibromatosis is a rare type of fibrous tumors which usually manifests as an ignored fast-growing skin plaque and characterized by benign mesenchymal-like tumor with fibrous hyperplasia. Therefore, it is suggested that clinicians should carefully identify such cutaneous tumor and earlier conduct biopsy to avoid wrong diagnosis.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

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