Overview of Proteus Syndrome

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Overview
Proteus syndrome is a very rare, sporadic, and complex congenital disorder. It is an autosomal dominant disease characterized by macrocephaly, lipomas, vascular malformations, asymmetry of the upper or lower limbs, and large flat feet. This syndrome is named after the Greek mythological sea god Proteus, who could change his form. The etiology is unknown, but some scholars believe it is related to genetic mutations. Other manifestations include hypocalcemia, seizures, and muscle atrophy, with treatment limited to symptomatic management.
Overview
“Proteus syndrome” does not have a family history or hereditary nature; all cases are sporadic, with equal incidence in males and females. Clinical presentations vary widely, with up to 150 different manifestations, and there is significant variation between cases. The pathological changes belong to a rare hamartomatous overgrowth syndrome, characterized primarily by asymmetric overgrowth of skin, bones, and soft tissues. Subcutaneous tumor-like lesions include: lipomas, vascular malformations, neurofibromas, mesenchymal tumors, and other connective tissue tumors, usually without malignant tumors.
Clinical

Clinical manifestations:

1. Short tubular bones thickened, long tubular bones thickened and elongated, with multiple osteochondromas appearing with age;

2. Craniofacial bone deformities, localized protrusions appearing as osteoma-like outward growth;

3. Excessive growth of vertebral bodies leading to irregular morphology and scoliosis;

4. Hypertrophic changes may also occur in the ribs and scapula;

5. Soft tissue changes: multiple subcutaneous tumors, tumors without defined borders.

Diagnostic Criteria

Proteus Syndrome – Diagnostic Criteria

In 1989 and 1994, the diagnostic criteria for “Proteus syndrome” were revised by the Walter Reed Army Medical Center and Stanford University School of Medicine in the USA. Based on the clinical manifestations of the disease, six diagnostic criteria were proposed and quantified with scores: ① Unilateral hypertrophy and/or macrodactyly 5.0 points; ② Plantar and/or palmar gyriform hyperplasia 4.0 points; ③ Lipomas and other subcutaneous tumors 4.0 points; ④ Verrucous nevi (epidermal nevi/sebaceous nevi) 3.0 points; ⑤ Macrocephaly and/or multiple exostoses of the skull 2.5 points; ⑥ Other minor anomalies 1.0 point. A total score of ≥13 points from the above six items can confirm the diagnosis of “Proteus syndrome.”

Typical Cases

Overview of Proteus Syndrome

Overview of Proteus Syndrome

Overview of Proteus Syndrome

Overview of Proteus Syndrome

Overview of Proteus Syndrome

Overview of Proteus Syndrome

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Overview of Proteus Syndrome

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