US and MRI appearance of a collagenous fibroma (desmoplastic fibroblastoma) of the shoulder

Abstract

Collagenous fibroma (desmoplastic fibroblastoma) is a recently described rare benign tumor. Since this tumor was characterized by Evans in 1995, fewer than 100 cases have been reported in English literature with the largest series published by Miettinen and Fetsch. Preoperative radiological diagnosis is important to avoid over-treatment and unnecessary extensive procedures, but is difficult because diagnostic imaging findings for collagenous fibroma have not been established. Here we report the US and MRI appearance of a lesion localized deep under the deltoid muscle in a 34-year-old woman with a palpable painless mass. Histological findings were consistent with a collagenous fibroma. As far as we know, this is the first description of US appearance of a collagenous fibroma in English literature.

Multimodal radiological imaging of collagenous fibroma arising from the subacromial region in a patient with osteosarcoma: A case report

“…Although the treatment for collagenous fibroma is local resection, with no demonstrated incidence of local recurrence or metastases, wide excision may be performed with wide margins including surrounding muscle to prevent local recurrence of desmoid tumors (9,12). It is therefore important to accurately diagnose tumors as collagenous fibroma using preoperative diagnostic imaging, to prevent overtreatment that may result in a loss of function (7,12). However, the radiological features of collagenous fibroma are not widely recognized as there are so few published studies.…”

“…MRI data for collagenous fibroma have been described previously (3)(4)(5)(6)(7)(8)(9)(10)(11)(12). All the cases predominantly described iso-intensity to muscle, including several areas of low intensity on T1-weighted images.…”

“…Diagnostic imaging data of collagenous fibroma have not been clearly described. Although magnetic resonance imaging (MRI) data for collagenous fibroma have been described in previous studies (3)(4)(5)(6)(7)(8)(9)(10)(11)(12), the tumors did not exhibit a common pattern, and often produced similar results compared with fibrous tumors, including desmoid tumors (13,14). It is important to achieve the correct diagnosis and offer management including surgical treatment for collagenous fibroma, as neither local recurrence nor metastasis following surgical resection have been identified.…”

Diagnosis and Differential Diagnosis of Desmoplastic Fibroblastoma by Clinical, Radiological, and Histopathological Analyses

“…The above-mentioned feature might be helpful to make differential diagnosis from other soft-tissue tumors because the majority of soft-tissue tumors were reported to have a high signal intensity on T2-weighted images. [ 10 11 ]…”

A Subcutaneous Tumour on the Posterior Neck: A Quiz

“…DFB has a varying intensity on MRI; intermediate intensity to low signal intensity on T1-WI and low to high signal intensity on T2-WI (6,(8)(9)(10). Interestingly, low signal intensity areas on T2-WI correspond to abundant collagen fibres and low cellularity, while high signal intensity areas on T2-WI represent dense fibroblast cells, loose collagen fibres, and abundant myxoid areas (8).…”