Koenen's tumor

Koenen's tumor is a benign skin lesion that is often associated with Tuberous Sclerosis Complex (TSC). It is also known as periungual fibroma or ungual fibroma and is characterized by the growth of a fibrous tumor around the nails, particularly the toenails.

Etiology

The exact cause of Koenen's tumor is not known. However, it is often associated with TSC, a genetic disorder that causes non-cancerous (benign) tumors to grow in different parts of the body. TSC is caused by mutations in the TSC1 or TSC2 genes.

Clinical Presentation

Koenen's tumors typically present as small, firm, flesh-colored nodules that grow around the nails. They can occur on both the fingers and toes, but are more common on the toes. The tumors are usually painless, but can cause discomfort or pain if they become large or are subjected to trauma.

Diagnosis

Diagnosis of Koenen's tumor is usually based on clinical examination. The presence of these tumors in a patient with known TSC can help confirm the diagnosis. In some cases, a biopsy may be performed to rule out other conditions.

Treatment

Treatment for Koenen's tumor is usually not necessary unless the tumors are causing discomfort or pain. In such cases, the tumors can be surgically removed. However, they may recur after removal.

Prognosis

The prognosis for Koenen's tumor is generally good as the tumors are benign and do not spread to other parts of the body. However, they can cause cosmetic concerns and discomfort, particularly if they become large or are located in areas that are subjected to trauma.

See Also

• Tuberous Sclerosis Complex
• TSC1
• TSC2

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