Stiff Skin Syndrome (Congenital Fascial Dystrophy)

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Stiff Skin Syndrome (Congenital Fascial Dystrophy)

Stiff skin syndrome is a rare autosomal dominant connective tissue disorder caused by mutations in the FBN1 gene encoding fibrillin 1 and is associated with overactivation of the transforming growth factor beta signaling pathway. The disorder leads to progressive development of rock hard indurated skin most prominently affecting the thighs, buttocks, lower back, and shoulders. Patients frequently develop limitation of mobility due to progressive joint contractures that most often involve large joints. Histopathology demonstrates prominent fascial sclerosis with increased fibroblast cellularity and thick collagen bundles within the deep reticular dermis or subcutaneous septa. These collagen bundles are typically thick and horizontally oriented. The disease represents a localized fibrosing disorder involving fascia and deep dermis rather than systemic sclerosis and typically lacks internal organ involvement.

Clinical Features

  • Medusa = Stony hard skin of thighs buttocks lower back and shoulders

Genetics

  • Fibrous Clothing = Fibrillin 1 mutation
  • Stone Gun = FBN1 fibrillin 1 gene autosomal dominant disorder
  • Tree Growth Factor B TGFB = Overactivation of the TGF beta signaling pathway

Musculoskeletal Findings

  • Kid Tied With Rope = Joint contractures of large joints

Histology

  • Sclerotic Snake On Fascial Ground = Fascial sclerosis on histology
  • Fibers Blasted = Increased fibroblast cellularity and thick collagen bundles
  • Rope = Thick horizontally oriented collagen bundles

Quiz

Question 1
Stiff skin syndrome is most commonly caused by mutation in which gene?

A. COL1A1
B. FBN1
C. ELN
D. TGFBR2

Question 2
What inheritance pattern is classically associated with stiff skin syndrome?

A. Autosomal recessive
B. Autosomal dominant
C. X linked recessive
D. Mitochondrial

Question 3
Which signaling pathway is overactivated in stiff skin syndrome?

A. Wnt beta catenin pathway
B. Transforming growth factor beta pathway
C. Hedgehog signaling pathway
D. Notch signaling pathway

Question 4
Which body regions are most commonly affected by the indurated skin in stiff skin syndrome?

A. Face and scalp
B. Palms and soles
C. Thighs buttocks lower back and shoulders
D. Abdomen and chest

Question 5
Which musculoskeletal manifestation is commonly seen in stiff skin syndrome?

A. Joint hypermobility
B. Joint contractures of large joints
C. Osteolysis
D. Myositis

Question 6
Which histologic feature is characteristic of stiff skin syndrome?

A. Subepidermal blister formation
B. Granulomatous inflammation
C. Fascial sclerosis
D. Epidermal acantholysis

Question 7
How are the collagen bundles typically arranged in stiff skin syndrome?

A. Vertically oriented
B. Randomly distributed
C. Horizontally oriented
D. Radially arranged

Answers:
1 B. FBN1
2 B. Autosomal dominant
3 B. Transforming growth factor beta pathway
4 C. Thighs buttocks lower back and shoulders
5 B. Joint contractures of large joints
6 C. Fascial sclerosis
7 C. Horizontally oriented