Diagnostic Considerations

Crouzon syndrome can present with acanthosis nigricans. During genetic testing, if no mutations are identified for FGFR2, a review of mutations on FGFR3 should be conducted. Crouzon syndrome comorbid with acanthosis nigricans typically yields positive results for the latter, while Crouzon syndrome without acanthosis nigricans is associated with the former.^{[14, 19, 38]}

In the course of genetic testing—should either mutations of FGFR2 or FGFR3 be absent—a screening for the interleukin 11 receptor alpha gene (IL11RA) on band 9p21 may prove fruitful. A case study conducted on members of a consanguineous family found evidence that Crouzon-like symptoms could manifest based on mutations in IL11RA.^[39]

Differential Diagnoses

Antley-Bixler Syndrome
Apert Syndrome
Carpenter Syndrome
Craniofrontonasal Dysplasia
Goldenhar Syndrome
Greig Syndrome
Jackson-Weiss Syndrome
Mandibulofacial Dysostosis (Treacher Collins Syndrome)
Marie-Sainton Syndrome
Mercedes Benz Craniosynostosis
Muenke Syndrome
Pfeiffer Syndrome
Saethre-Chotzen Syndrome

Workup

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Media Gallery

Acrocephaly, beaked nose, "frog face," and pseudoprognathism of Crouzon syndrome.
Malposed teeth and acanthosis nigricans around the mouth in Crouzon syndrome.
No physiological spinal curvature is observed in Crouzon syndrome.
Acanthosis nigricans of the axillary fossa in Crouzon syndrome.
Short stature and dark skin of Crouzon syndrome.

of 5

Author

Amarateedha Prak LeCourt, MD Resident Physician, Department of Anesthesiology, Naval Medical Center San Diego; Naval Flight Surgeon/Fleet Marine Force Qualified Officer, US Navy

Amarateedha Prak LeCourt, MD is a member of the following medical societies: Aerospace Medical Association, Association of Military Surgeons of the US

Disclosure: Nothing to disclose.

Coauthor(s)

Kristina Marie Dela Rosa, MD Dermatologist, Insight Dermatology, San Diego, CA

Kristina Marie Dela Rosa, MD is a member of the following medical societies: American Academy of Dermatology, American Medical Association

Disclosure: Nothing to disclose.

Homavirak Prak, BA Emergency Medical Technician, Basic AirCare Ambulance; Medical Scribe, Progeny Psychiatric Group

Disclosure: Nothing to disclose.

Specialty Editor Board

Michael J Wells, MD, FAAD Dermatologic/Mohs Surgeon, The Surgery Center at Plano Dermatology

Michael J Wells, MD, FAAD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Dermatology, American Medical Association, Texas Medical Association

Disclosure: Nothing to disclose.

Robert A Schwartz, MD, MPH Professor and Head of Dermatology, Professor of Pathology, Professor of Pediatrics, Professor of Medicine, Rutgers New Jersey Medical School

Robert A Schwartz, MD, MPH is a member of the following medical societies: Alpha Omega Alpha, American Academy of Dermatology, New York Academy of Medicine, Royal College of Physicians of Edinburgh, Sigma Xi, The Scientific Research Honor Society

Disclosure: Nothing to disclose.

Chief Editor

Dirk M Elston, MD Professor and Chairman, Department of Dermatology and Dermatologic Surgery, Medical University of South Carolina College of Medicine

Dirk M Elston, MD is a member of the following medical societies: American Academy of Dermatology

Disclosure: Nothing to disclose.

Additional Contributors

Jacek C Szepietowski, MD, PhD Professor, Vice-Head, Department of Dermatology, Venereology and Allergology, Wroclaw Medical University; Director of the Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Poland

Disclosure: Received consulting fee from Orfagen for consulting; Received consulting fee from Maruho for consulting; Received consulting fee from Astellas for consulting; Received consulting fee from Abbott for consulting; Received consulting fee from Leo Pharma for consulting; Received consulting fee from Biogenoma for consulting; Received honoraria from Janssen for speaking and teaching; Received honoraria from Medac for speaking and teaching; Received consulting fee from Dignity Sciences for consulting; .

Grazyna Szybejko-Machaj, MD, PhD Assistant Professor, Department of Dermatology, Wroclaw Medical University

Disclosure: Nothing to disclose.

Lukasz Matusiak, MD, PhD Assistant, Department and Clinic of Dermatology, Venereology and Allergology, Medical University of Wroclaw

Disclosure: Nothing to disclose.

Acknowledgements

The authors and editors of Medscape Reference gratefully acknowledge the contributions of previous author, Mieczyslawa Miklaszewska, MD, to the development and writing of this article.

Crouzon Syndrome Differential Diagnoses

Diagnostic Considerations

Differential Diagnoses

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