Piloleiomyoma

Piloleiomyoma is a type of cutaneous condition that is characterized by the growth of smooth muscle cells in the skin. It is a rare condition and is also known as pilar leiomyoma or pilomatrixoma.

Overview

Piloleiomyomas are benign tumors that originate from the arrector pili muscle, a type of smooth muscle that is associated with hair follicles. These tumors are typically small, ranging from a few millimeters to a few centimeters in diameter, and are often multiple and clustered. They can occur anywhere on the body but are most commonly found on the extremities, particularly the arms and legs.

Symptoms

The most common symptom of piloleiomyoma is pain, which can be triggered by cold, pressure, or emotional stress. The pain is thought to be caused by the contraction of the smooth muscle cells in the tumor. Other symptoms can include redness, swelling, and changes in the color or texture of the skin over the tumor.

Diagnosis

The diagnosis of piloleiomyoma is typically made based on the clinical presentation and confirmed by a skin biopsy. Under the microscope, the tumor is composed of bundles of smooth muscle cells that are oriented in different directions. The cells have a characteristic "cigar-shaped" nucleus and are surrounded by a thin layer of connective tissue.

Treatment

The treatment of piloleiomyoma is primarily aimed at relieving the pain. This can be achieved with medications such as nonsteroidal anti-inflammatory drugs (NSAIDs) or calcium channel blockers. In some cases, the tumors may be removed surgically. However, because piloleiomyomas are often multiple and can recur after removal, surgery is usually reserved for cases where the tumors are causing significant pain or cosmetic concerns.

See also

• Leiomyoma
• Skin tumor
• Arrector pili muscle