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Proteus syndrome — Clinical Guidelines

Overview

Proteus syndrome is a rare disorder characterized by mosaic postnatal overgrowth affecting multiple tissues, including bone, soft tissue, and skin, often leading to asymmetric growth and severe skeletal distortion 1. It is primarily associated with somatic activating mutations in the AKT1 gene 1.

Diagnosis

Key Diagnostic Criteria: Asymmetric overgrowth of tissues, skin abnormalities (e.g., cerebriform collagenomas), skeletal deformities, and presence of AKT1 mutation 1 3 4.

Recommended Tests: Genetic testing for somatic AKT1 mutations, particularly in lesional tissue 1.

Clinical Features: May include varicose veins, epidermal nevi, macrodactyly, hemimegalencephaly, and liver involvement 3 4.

Differential Diagnosis: Distinguish from other overgrowth syndromes like Klippel-Trenaunay syndrome 4.

Management

First-Line Treatments: Management of complications such as venous ulcers, infections, and orthopedic issues 4.

Adjunctive Treatments: Local interventions like sclerotherapy for vascular malformations 4.

Anesthesia Considerations: Airway management may require advanced techniques such as fiberoptic intubation due to potential airway abnormalities 5.

Supportive Care: Physical therapy, orthopedic interventions, and psychological support 4.

Special Populations

Pediatrics: Early diagnosis and multidisciplinary care are crucial for managing growth abnormalities and associated complications 1 4.

Comorbidities: Presence of refractory epilepsy (Ohtahara syndrome) and complex congenital heart defects may require specialized neurology and cardiology interventions 2 8.

Key Recommendations

Genetic testing for AKT1 mutations should be performed in lesional tissue to confirm diagnosis 1 (Evidence: Strong).

Multidisciplinary management involving orthopedic, dermatologic, and neurologic specialists is essential for comprehensive care 1 4 8 (Evidence: Moderate).

Advanced airway management techniques may be necessary during anesthesia due to potential anatomical abnormalities 5 (Evidence: Weak).

References

1 Wee JS, Mortimer PS, Lindhurst MJ, Chong H, Biesecker LG, Holden CA. A limited form of proteus syndrome with bilateral plantar cerebriform collagenomas and varicose veins secondary to a mosaic AKT1 mutation. JAMA dermatology 2014. link 2 Bastos H, da Silva PF, de Albuquerque MA, Mattos A, Riesgo RS, Ohlweiler L et al.. Proteus syndrome associated with hemimegalencephaly and Ohtahara syndrome: report of two cases. Seizure 2008. link 3 Ahmetoğlu A, Işik Y, Aynaci O, Bahadir S, Aynaci FM. Proteus syndrome associated with liver involvement: case report. Genetic counseling (Geneva, Switzerland) 2003. link 4 Dragieva G, Stahel HU, Meyer M, Kempf W, Häffner A, Burg G et al.. Proteus syndrome. VASA. Zeitschrift fur Gefasskrankheiten 2003. link 5 Pennant JH, Harris MF. Anaesthesia for Proteus syndrome. Anaesthesia 1991. link 6 Seward GR. The Elephant Man. Part II. British dental journal 1990. link 7 Raman R, Kumar V, Arianayagam S, Peh SC. A unilateral mesenchymal disorder of the head. Journal of cranio-maxillo-facial surgery : official publication of the European Association for Cranio-Maxillo-Facial Surgery 1989. link80088-5) 8 Mayatepek E, Kurczynski TW, Ruppert ES, Hennessy JR, Brinker RA, French BN. Expanding the phenotype of the Proteus syndrome: a severely affected patient with new findings. American journal of medical genetics 1989. link

Proteus syndrome