Patient's question:
Scattered facial nodules and 7-8 years of oval-shaped nail-sized white spots on the foreheadDoctor's answer:
The symptoms of this disease vary in frequency and severity depending on the age of onset, primarily manifesting in four aspects: intellectual disability, seizures, skin damage, and tumors in various organs, including the brain.1. Intellectual Disability: Approximately 90% of affected children have intellectual levels below normal. The degree of intellectual disability can range from mild to severe, typically becoming apparent around the age of 3 and gradually worsening with age, accompanied by delayed language development. Most children with intellectual disability also experience seizures.
2. Seizures: Seizures are a prominent symptom of this disease, affecting 80–90% of affected children. Seizures often begin before the age of 2, initially manifesting as infantile spasms-like or small motor seizures. As the child grows older, they may progress to focal or grand mal seizures. Occasionally, seizures may temporarily subside, but in most cases, seizures associated with tuberous sclerosis are difficult to control with antiepileptic drugs and may lead to death from status epilepticus.
3. Skin Manifestations: Skin symptoms may be present at birth but often appear between the ages of 3 and 10, gradually increasing in number and becoming most pronounced during adolescence. There are four clinical manifestations: sebaceous adenomas, hypopigmented macules, periungual fibromas, and granular patches.
(1) Sebaceous Adenomas: The most common skin lesion, seen in 80–90% of patients. These appear as firm, scattered, reddish-brown telangiectatic papules, with a diameter of 0.1–1 cm. Sebaceous adenomas are most abundant near the nasolabial folds and spread to the cheeks, forehead, and lower jaw, exhibiting bilateral symmetry with no subjective symptoms.
(2) Hypopigmented Macules (White Spots): Another common skin sign. Watson (1978) noted that 85% of children exhibit this lesion early in life, often appearing before other skin manifestations. These are oval-shaped, segmental, or lobular hypopigmented patches of varying sizes, typically 1–3 cm in diameter. They are most frequently found on the abdomen, back, lateral lower limbs, or other areas. Children often experience seizures within a few years of developing these macules, making them of significant diagnostic value.
(3) Periungual Fibromas (Kaposi’s Tumors): These typically appear shortly after birth or during puberty. They are papilloma-like, firm, bright red growths that arise from the nail fold or under the nail plate, measuring 0.5–1 cm in length and often multiple in number.
(4) Granular Patches: These are slightly elevated, granular plaques with a slightly greenish hue, softer in texture, and of varying sizes. They are commonly distributed over the lumbosacral region. Occasionally, they may resemble a sharkskin texture, known as a "shagreen patch."
4. Tumors in Various Organs: Intracranial tumors are relatively uncommon. About half of affected children develop retinal astrocytomas, while retinal translucent or cystic nodules are also relatively frequent. Tumors may also occur in the skin, lungs, kidneys, bones, and heart. Rhabdomyosarcoma is a significant contributor to early mortality, as most children with cardiac involvement die before puberty. Additionally, multiple endocrine abnormalities have been observed in patients with this condition.
[Laboratory Tests]
1. X-ray Examination: About 75% of affected children show calcified nodules in cranial X-rays, particularly in the basal ganglia region. Calcified areas often extend toward the ventricular walls, appearing as "wax drop" images. The phalanges, metacarpals, and metatarsals exhibit widespread osteoporosis and small cystic-like defects in the cortex. CT scans reveal ventricular enlargement and cortical atrophy, with hyperdense areas surrounding the cortex, which appear earlier than calcified points on cranial X-ray films.
2. Electroencephalography (EEG): EEG is often abnormal and varies significantly with the progression of the disease. In infancy, EEG frequently shows high-amplitude irregular rhythms. Other abnormal EEG patterns may include persistent focal or diffuse abnormalities, such as spikes, sharp waves, spike-and-wave complexes, or slow waves.
[Prognosis] The prognosis varies widely among affected children. Those with severe intellectual disability may require complete dependence on others. Some children may die prematurely due to status epilepticus, brain tumors, renal failure, or cardiac tumors.
[Diagnosis] Typical cases with characteristic skin lesions, seizures, and intellectual disability are relatively easy to diagnose. The presence of hypopigmented macules, infantile spasms, and developmental delays in infants also aids in diagnosis. Additionally, a positive family history, cranial X-rays, and CT scans are important for diagnosis.
[Treatment] There is currently no specific treatment. Antiepileptic drugs can be used for seizures, and ACTH may be administered if EEG shows severe dysrhythmia. Surgical resection of affected cerebral cortex and subcortical nodules may stop seizures but is only suitable for patients with a single lesion and relatively preserved intellectual function.