Diagnosis of tuberous sclerosis complex

Area of Science:

• Genetics
• Medical Genetics
• Oncology

Background:

• Tuberous sclerosis complex (TSC) is a genetic disorder with diverse clinical presentations, often complicating diagnosis, especially in young patients or those with subtle signs.
• Phenotypic variability in TSC necessitates updated diagnostic approaches to accurately identify affected individuals.

Purpose of the Study:

• To present the recently revised consensus diagnostic criteria for tuberous sclerosis complex.
• To incorporate improved understanding of TSC's clinical, genetic, and molecular underpinnings into diagnostic guidelines.

Main Methods:

• Review and synthesis of clinical manifestations, genetic factors, and molecular mechanisms of TSC.
• Establishment of revised diagnostic criteria based on the presence of specific lesions across organ systems.

Main Results:

• The revised criteria emphasize that no single sign is pathognomonic for TSC.
• Diagnosis confirmation requires evidence of TSC-associated lesions in at least two organ systems or two distinct lesions within a single organ.
• DNA testing is a valuable adjunct, aiding genetic counseling and prenatal diagnosis, though it has limitations.

Conclusions:

• The revised diagnostic criteria for tuberous sclerosis complex improve diagnostic accuracy by considering a broader range of clinical findings.
• While DNA testing is beneficial, its false-negative rate and germline mosaicism require continued reliance on clinical evaluation for definitive diagnosis.
• Accurate diagnosis of tuberous sclerosis complex is crucial for timely management and genetic counseling.