Cobb syndrome
Rare congenital disorder with skin and spinal vascular lesions.
Cobb syndrome is a rare condition present from birth, marked by both visible skin changes and abnormal blood vessel formations—either angiomas or arteriovenous malformations (AVMs)—inside the spinal canal. The skin findings often appear as port wine stains or angiomas, though angiokeratomas, angiolipomas, and lymphangioma circumscriptum have also been reported. The spinal lesions occur at levels matching the affected skin areas and can lead to spinal cord problems, including weakness or paralysis. First noted by Berenbruch in 1890, the disorder gained wider recognition after Cobb’s 1915 report. It affects males and females equally, with fewer than 100 documented cases. Because parents of affected children typically show no signs, a sporadic mutation is thought to be the cause.
Signs and symptoms may not appear until childhood or young adulthood, when patients often experience sudden pain, numbness, or weakness in the limbs. These symptoms can improve, stay stable, or worsen in steps or steadily over time. Early weakness may signal a more aggressive course. Less commonly, bowel or bladder issues are the first signs. The main disability comes from progressive weakness, paralysis, sensory loss, and loss of bowel and bladder control. If treatment is delayed, a complication called Foix-Alajouanine syndrome—subacute necrotic myelopathy from a spinal angioma thrombosis—can occur. Skin lesions can appear anywhere along a dermatome, from the midline back to the abdomen; midline back lesions may be linked to spina bifida. The skin mark may be faint but can become more noticeable when the patient performs a Valsalva maneuver, which increases abdominal pressure and fills the cutaneous angioma. Neurological exams show weakness or paralysis and numbness with a sharp upper boundary.
Diagnosis is made using MRI, supplemented by medullary angiography.
- First described
- Berenbruch in 1890
- Widely known after
- Cobb's report in 1915
- Reported cases
- less than 100
- Cause
- sporadic mutation
- Typical onset
- childhood or young adulthood
Lore & Background
Cobb syndrome is present at birth, but clinical manifestations often appear later in life. Patients typically experience sudden onset of pain, numbness, or weakness in the extremities as children or young adults. These symptoms may remit or remain stable and often localize below a specific dermatome. Symptoms tend to worsen over time, either in discrete steps or continuously, and early development of weakness may indicate a more aggressive course. Less commonly, weakness or bowel and bladder dysfunction may be presenting symptoms.
Reader's Guide
Cobb syndrome is significant as a rare congenital disorder linking visible skin lesions to underlying spinal vascular malformations. The skin lesions, typically port wine stains or angiomas, occur in dermatomes corresponding to intraspinal angiomas or AVMs, which can cause spinal cord dysfunction, weakness, or paralysis. Diagnosis relies on MRI and medullary angiography. A possible complication if treatment is delayed is Foix-Alajouanine syndrome, or subacute necrotic myelopathy, due to thrombosis in the spinal angioma. The condition's rarity and sporadic mutation origin underscore its importance in differential diagnosis of spinal and cutaneous vascular anomalies.
Did You Know?
- Cobb syndrome was first described by Berenbruch in 1890 but became widely known after Cobb's report in 1915.
- The skin lesions may include angiokeratomas, angiolipomas, and lymphangioma circumscriptum in addition to port wine stains.
- The cutaneous lesion may become more pronounced when the patient performs a Valsalva maneuver.
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