Management of Twins with Tuberous Sclerosis Complex

Initial Diagnostic Approach

The American College of Medical Genetics recommends confirming TSC diagnosis in both twins through genetic testing for TSC1 and TSC2 mutations, as this provides definitive diagnosis and informs family planning 3
The American Journal of Obstetrics and Gynecology suggests determining chorionicity and amnionicity if the twins are still in utero, as monochorionic twins require additional surveillance for twin-specific complications 4
The National Institute of Diabetes and Digestive and Kidney Diseases recommends performing baseline clinical assessment including complete history, kidney/abdominal imaging, kidney function assessment, proteinuria screening, and blood pressure measurement at diagnosis 5

The Tuberous Sclerosis Complex Society recommends that all TSC patients, including twins, require referral to a specialized center with expertise across multiple disciplines including neurology, nephrology, pulmonology, dermatology, and cardiology 1, 2
The American Academy of Pediatrics suggests that structured follow-up visits should occur at least annually, ideally coordinating multiple specialists on the same day 5, 1

The American Academy of Neurology recommends monitoring for epilepsy, which is the leading cause of mortality in TSC and occurs in approximately 82% of patients 3
The Child Neurology Society suggests obtaining brain MRI every 1-3 years until age 25 to monitor for subependymal giant cell astrocytomas (SEGA) 3

The National Kidney Foundation recommends beginning kidney monitoring at diagnosis, even in infancy, as both cysts and angiomyolipomata can develop in the first months of life 1, 3
The American Journal of Kidney Diseases suggests abdominal ultrasound every 1-3 years until age 12, then transition to MRI every 1-3 years 3
The National Institute of Diabetes and Digestive and Kidney Diseases recommends annual kidney function assessment and proteinuria screening in all patients with kidney involvement on imaging 1, 3

The American Heart Association recommends fetal echocardiography for all monochorionic twins due to increased risk of congenital heart disease 6, 7
The American College of Cardiology suggests that approximately two-thirds of newborns with TSC have cardiac rhabdomyomas, which are largest during the neonatal period and typically regress with time 3

The American College of Cardiology recommends annual standardized office blood pressure measurements for all patients 1, 3
The American Heart Association suggests 24-hour ambulatory blood pressure monitoring if BP ≥120/70 mmHg in adults 1
The American Society of Hypertension recommends first-line antihypertensive treatment: ACE inhibitors or ARBs 1, 2

The American Journal of Obstetrics and Gynecology recommends beginning ultrasound surveillance for twin-twin transfusion syndrome (TTTS) at 16 weeks, continuing at least every 2 weeks until delivery 4
The Society for Maternal-Fetal Medicine suggests incorporating Doppler MCA-PSV determinations beginning at 16 weeks to screen for twin anemia-polycythemia sequence (TAPS) 4

The American College of Medical Genetics recommends discussing genetic screening with family members 1
The National Society of Genetic Counselors suggests that family members with TSC clinical features should be screened for the relevant pathogenic variant if known 1
The American Society of Human Genetics recommends that parents of seemingly sporadic TSC cases have a 1-2% risk of having another affected child due to possible germline mosaicism 3

The Tuberous Sclerosis Complex Society recommends not assuming normal kidney imaging in young children excludes future kidney disease—lesions can develop at any time 1, 3
The National Kidney Foundation suggests not delaying referral to specialized centers—TSC is often not recognized by clinicians without specialist knowledge 1, 3