To the Editor:
Cardiac rhabdomyomas are benign hamartomas that are common in patients with tuberous sclerosis complex (TSC). 1 We describe a patient who presented with large infantile hemangiomas (IHs) and hypopigmented macules, which prompted further testing that eventually showed concomitant multiple cardiac rhabdomyomas in the context of TSC.
A 5-week-old girl—who was born at 38 weeks and 3 days’ gestation via uncomplicated vaginal delivery—was referred to our pediatric dermatology clinic for evaluation of multiple erythematous lesions on the scalp and left buttock that were first noticed 2 weeks prior to presentation. There was a family history of seizures in the patient’s mother. The patient’s older brother did not have similar symptoms.
Physical examination revealed 2 nonulcerating erythematous nodules on the middle and posterior left vertex scalp that measured 2.5×2 cm (Figure 1A) as well as 1 bright red plaque on the left buttock (Figure 1B). Five hypopigmented macules, ranging from 5 mm to 1.5 cm in diameter, also were detected on the left thorax (Figure 2A) as well as the middle and lower back (Figure 2B). These findings, along with the history of seizures in the patient’s mother, prompted further evaluation of the family history, which uncovered TSC in the patient’s mother, maternal aunt, and maternal grandmother.
The large IHs on the scalp did not pose concerns for potential functional impairment but were still considered high risk for permanent alopecia based on clinical practice guidelines for the management of IH. 2 Treatment with oral propranolol was recommended; however, because of a strong suspicion of TSC due to the presence of 5 hypopigmented macules measuring more than 5 mm in diameter (≥3 hypopigmented macules of ≥5 mm is one of the major criterion for TSC), the patient was referred to cardiology prior to initiation of propranolol.
Echocardiography revealed 3 intracardiac masses measuring 4 to 5 mm in diameter in the left ventricle (LV), along the interventricular septum and the LV posterior wall. These masses were consistent with rhabdomyomas (Figure 3)—a major criterion for TSC—which had not been detected by prenatal ultrasonography. No obstruction to LV inflow or outflow was observed. Additionally, no arrhythmias were detected on electrocardiography.
The patient was cleared for propranolol, which was slowly uptitrated to 2 mg/kg/d. She completed the course without adverse effects. The treatment of IH was successful with substantial reduction in size over the following months until clearance. She also was referred to neurology for magnetic resonance imaging of the brain, which showed a 3-mm subependymal nodule in the lateral right ventricle, another major feature of TSC.
FIGURE 1 . Infantile hemangiomas. A, Two 2.5×2-cm erythematous nodules on the middle and posterior left vertex scalp. B, A bright red plaque on the left buttock.
Cardiac rhabdomyomas are benign hamartomas that affect as many as 80% of patients with TSC 1 and are primarily localized in the ventricles. Although cardiac rhabdomyomas usually regress over time, they can compromise ventricular function or valvular function, or both, and result in outflow obstruction, arrhythmias, and Wolff- Parkinson-White syndrome. 3 Surgical resection may be needed in patients whose condition is refractory to medical management for heart failure.