Superficial fibromatosis is a benign but locally aggressive fibroblastic proliferation arising from fascia and aponeurosis. It most commonly presents in palmar (Dupuytren contracture, 60-70%), plantar (Ledderhose disease, 20-25%), and penile (Peyronie disease, 10-15%) forms. The tumor consists of myofibroblast proliferation and over time produces contractile force leading to flexion contracture. Genetic predisposition is strong (family history 60-70%), with diabetes, alcohol use, and repetitive trauma as risk factors. US is the primary diagnostic modality, appearing as a fascia-associated, hypoechoic, fusiform nodule; a nodule showing continuity with fascia is a pathognomonic finding.
Age Range
30-80
Peak Age
55
Gender
Male predominant
Prevalence
Uncommon
Superficial fibromatosis results from clonal proliferation of myofibroblasts within fascia. Myofibroblasts carry both fibroblast and smooth muscle cell characteristics — expressing alpha-smooth muscle actin (α-SMA) and producing active contractile force. This contractile activity leads over time to progressive fascia shortening and flexion contracture: finger flexion contracture in Dupuytren (4th and 5th finger MCP and PIP joints), painful plantar nodules in Ledderhose. The disease progresses through three histological stages: (1) proliferative — high cellularity, active myofibroblast proliferation, prominent neovascularization; (2) involutional — myofibroblasts synthesize collagen and fibrous replacement begins; (3) residual — mature type III collagen dominant, minimal cellularity. This stage progression directly affects imaging characteristics on US and MRI: in the proliferative stage, high cell density creates homogeneous tissue with low acoustic impedance → markedly hypoechoic on US; in mature fibrous stage, as collagen deposition increases the acoustic impedance approaches that of surrounding fascia/aponeurosis → echogenicity increases, the lesion may become isoechoic or mildly hyperechoic. The same correlation applies to MRI: high water content in cellular stage → T2 hyperintensity; collagen dominance in fibrous stage → T2 hypointensity. Activation of the Wnt/β-catenin signaling pathway and TGF-β overexpression play central roles in pathological myofibroblast proliferation.
Fusiform hypoechoic nodule showing continuity with aponeurosis/fascia is the signature US finding of superficial fibromatosis (Dupuytren/Ledderhose). This fascia association is a critical diagnostic clue for differentiating from other subcutaneous-origin tumors (schwannoma, neurofibroma, lipoma). The echogenic fascial band continues uninterrupted at both ends of the nodule — 'fascia continuity sign'.
On B-mode US, superficial fibromatosis appears as a well-defined, fusiform (spindle-shaped) hypoechoic nodule within or adherent to fascia/aponeurosis. In Dupuytren disease, located along palmar aponeurosis; in Ledderhose, along plantar aponeurosis. The nodule is usually 0.5-3 cm in size with long axis parallel to the skin surface. Internal structure is homogeneously hypoechoic in cellular stage, may be more heterogeneous or isoechoic in fibrous stage. Nodule-fascia continuity is the diagnostic clue: the echogenic fascial band continues uninterrupted at both ends of the nodule or tapers into the nodule.
Report Sentence
A fusiform hypoechoic nodule showing continuity with the palmar/plantar aponeurosis fascia is seen, consistent with superficial fibromatosis.
On color and power Doppler, fibromatosis nodule generally shows low or absent internal vascularity. Minimal internal vascularity may be present in early proliferative stage due to neovascularization — this finding indicates active disease stage and aids treatment planning. Vascularity is completely absent in mature fibrous stage. Power Doppler is more sensitive than color Doppler for detecting low-velocity flow and may demonstrate minimal vascularity in early-stage lesions. Increased vascularity should raise concern for malignant transformation — though malignant transformation is extremely rare in superficial fibromatosis.
Report Sentence
No vascularity is identified within the nodule on power Doppler, consistent with a low-vascularity fibrous lesion.
In Dupuytren disease, cord-like thickening (Dupuytren cord) along the palmar aponeurosis is seen in addition to nodules. This cord appears as a hypoechoic or isoechoic band, thickened 2-5 times compared to normal aponeurosis (normal <1mm, cord 2-5mm). The cord extends between flexor tendons and skin, forming the anatomic substrate of finger flexion contracture. Multiple cords may coexist in the same hand — pretendinous cord (most common), spiral cord, natatory cord, and Cleland cord follow different anatomic courses. Evaluation of cord-tendon-neurovascular bundle relationship with US is critical for surgical planning.
Report Sentence
Cord-like thickening along the palmar aponeurosis is noted, consistent with Dupuytren disease.
Fibromatosis is frequently multifocal — multiple nodules may be seen along the same aponeurosis. In Dupuytren, multiple palmar nodules and cords are seen together; in Ledderhose, multiple plantar nodules may be bilateral. Bilateral involvement is common (40-60% Dupuytren, 25% Ledderhose). Simultaneous ipsilateral hand and foot involvement is termed 'fibromatosis diathesis' indicating more aggressive course. Multifocality strongly supports diagnosis and eliminates differential diagnosis challenges of solitary nodules. Bilateral screening should be routine — the contralateral hand/foot should also be examined.
Report Sentence
Multiple fusiform hypoechoic nodules along the palmar/plantar aponeurosis are noted, suggesting multifocal fibromatosis.
On MRI T2, fibromatosis nodule shows variable signal depending on cellular composition. Cellular (active, proliferative) nodules are T2 hyperintense: high water content myofibroblast density provides long T2 relaxation. Fibrous (mature, residual) nodules are T2 hypointense: mature collagen dominant structure causes short T2 relaxation. This signal variation reflects disease stage and guides treatment planning — T2 hyperintense (active) lesions respond better to collagenase injection or radiotherapy. Enhancement is prominent in early cellular stage (neovascularization and increased capillary permeability), minimal in late fibrous stage.
Report Sentence
The fascia-associated nodule shows hyperintense signal on T2, consistent with fibromatosis in the active cellular stage.
During dynamic US with finger flexion-extension movement, the relationship of Dupuytren cord with the flexor tendon is assessed. The spiral cord can surround and 'displace' the digital nerve and artery — preoperative US demonstration of this relationship prevents iatrogenic nerve/artery injury. If the cord is adherent to tendon, it moves with tendon movement (tethering); if non-adherent, it remains independent. Cord-neurovascular bundle relationship is assessed with color Doppler — the digital artery course may be medialized or lateralized by the cord. This dynamic assessment provides information that static MRI cannot, and is the gold standard for surgical planning.
Report Sentence
Dynamic assessment shows cord adhesion to the flexor tendon; the digital artery is displaced by the cord — an important finding for surgical planning.
On strain elastography, fibromatosis nodule appears markedly stiff (blue coding) compared to surrounding tissue. Strain ratio is generally >4 (lesion/surrounding subcutaneous fat). This stiffness reflects the myofibroblast and collagen composition. On shear wave elastography, elasticity values typically range 40-120 kPa — higher in fibrous stage, lower in cellular stage. Elastography finding is not diagnostic but aids stage determination and may be used for treatment response monitoring.
Report Sentence
The nodule appears markedly stiff compared to surrounding tissue on elastography.
Criteria
Palmar aponeurosis involvement, nodule+cord, flexion contracture. Most common at 4th and 5th finger MCP and PIP joints. More common in males (M:F=7:1), peak 40-60 years.
Distinct Features
Most common form (60-70%). Treatment: collagenase injection (Xiapex), needle aponeurotomy, fasciectomy. Recurrence 20-50%. Bilateral 40-60%.
Criteria
Plantar aponeurosis involvement, nodules dominant (cord rare), contracture rare. May present with painful walking.
Distinct Features
Less common than Dupuytren (20-25%). Bilateral 25%. Conservative treatment first choice (orthosis, steroid injection). Surgery: high recurrence risk (50-100%). Radiotherapy may reduce recurrence.
Criteria
Tunica albuginea involvement, plaque/nodule formation, penile curvature.
Distinct Features
Hypoechoic plaque along tunica albuginea on US. May contain calcification (in chronic stage). May be associated with erectile dysfunction. Treatment: intralesional verapamil/collagenase, surgery (plaque incision+grafting).
Criteria
Fibrous nodules on dorsal surface of proximal interphalangeal (PIP) joints.
Distinct Features
May be part of fibromatosis diathesis (Dupuytren + Ledderhose + Peyronie + knuckle pads). Treatment usually not needed. Seen as dermal/subcutaneous hypoechoic nodule on US.
Distinguishing Feature
DFSP is dermal-origin with tentacle-like extensions and irregular margins. Fibromatosis is fascia/aponeurosis-origin, fusiform-shaped showing continuity with fascia. DFSP shows more increased vascularity.
Distinguishing Feature
GCTTS is tendon sheath-associated and encases the tendon (splaying). Shows low signal on MRI T2 due to hemosiderin and blooming on GRE/SWI. Fibromatosis is fascia-associated and T2 signal is stage-dependent (cellular = hyperintense, fibrous = hypointense).
Distinguishing Feature
Foreign body granuloma shows central hyperechoic structure (foreign body) + posterior shadowing or reverberation artifact with trauma history. Fibromatosis is homogeneously hypoechoic, fusiform, fascia-associated without foreign body structure.
Urgency
routineManagement
conservativeBiopsy
Not NeededFollow-up
12-monthTreatment depends on stage and symptom level. Early stage (nodule, no contracture): observation, steroid injection, radiotherapy. Intermediate stage (progressing contracture, MCP/PIP total contracture >30°): collagenase injection (Xiapex/Xiaflex), needle aponeurotomy. Advanced stage (fixed contracture >30°, functional limitation): fasciectomy (limited or radical). Recurrence rate after fasciectomy is 20-50%; radical fasciectomy reduces recurrence but increases complication risk (nerve/artery damage, skin compromise). US follow-up annually — nodule size, number, stage (echogenicity change), and contracture angle are evaluated. Biopsy usually not needed — typical clinical and US findings are diagnostic.
Superficial fibromatosis is benign with no malignant transformation risk. Dupuytren disease may develop finger flexion contracture — advanced cases may require collagenase injection or surgery. Ledderhose disease presents primarily with painful walking — conservative treatment (orthotics, steroid injection) is first-line. Bilateral disease and association with Peyronie disease may occur.