Understanding Leiomyomas: Definition, Types, and Clinical Characteristics

An leiomyoma is a tumor benign composed exclusively of smooth muscle. Given its composition, it has the capacity to originate in any tissue where smooth muscle is present. A well-known subtype is that which arises from the uterine smooth muscle, commonly referred to as uterine fibroids.

When leiomyomas affect the skin, they are called cutaneous leiomyomas and are classified into three main subtypes, each derived from smooth muscle in specific tissues or organs, presenting clinical or histological distinctive aspects:

• Pilar leiomyoma
• Angioleiomyoma
• Genital leiomyoma

Below, we analyze the specific characteristics of each of these types of cutaneous tumors.

Pilar Leiomyoma: Characteristics and Genetic Associations

• It originates in the arrector pili muscle, an integral part of the pilosebaceous unit. pilosebaceous unit.
• It manifests as lesions solitary or multiple lesions.
• The presence of multiple lesions can be observed sporadically or be hereditary. In the latter case, it is transmitted following an autosomal dominant pattern, often associated with uterine fibroids in the context of hereditary leiomyomatosis and renal cell carcinoma (syndrome) or as part of Reed's syndrome (multiple cutaneous and uterine leiomyomatosis). cancer of renal cell (syndrome) or as part of Reed's syndrome (multiple cutaneous and uterine leiomyomatosis).

Angioleiomyoma: Vascular Origin

• Its origin is specifically found in the smooth muscle tissue that forms the vascular wall. vascular.
• Generally, it presents as a . The cherry angioma is histologically distinguished by being composed of solitary lesion.

Genital Leiomyoma: The Least Common Subtype

• It originates in the dartos muscle of the scrotum or the labia major, or by deriving from the erectile muscle present in the nipples.
• It usually manifests as a single, isolated lesion.
• This constitutes the least frequent subtype among cutaneous leiomyomas.

Prevalence and Demographics of Leiomyomas

It is important to note the disparity in reported frequency: uterine leiomyomas constitute approximately 95% of all diagnosed cases. In the context of extrauterine leiomyomas, cutaneous ones account for about 75% of reports.

• The incidence the incidence of these tumors is not strongly conditioned by race.
• While solitary cutaneous leiomyomas usually appear in adulthood, multiple pilar leiomyomas typically appear in the second or third decade of life, generally between 10 and 30 years of age.
• Excluding autosomal dominant inheritance syndromes autosomal dominant, the incidence rate of pilar leiomyoma is equal between men and women. On the other hand, angioleiomyomas are more common in women (approximate ratio of 2:1), although cavernous and that facilitate the transit of erythrocytes, and the white pulp, composed of lymphoid cell aggregates that surround the central arteries. tend to be more frequent in the male population.

Clinical Manifestations of Various Leiomyomas

Generally, leiomyomas present a significant painful component.

• This pain can manifest spontaneously or be provoked by various stimuli, both physical and emotional, including exposure to cold or the application of pressure. Furthermore, events such as menstruation or pregnancy can act as pain triggers.

Clinical Presentation of Pilar Leiomyomas

• There is a high probability that they will present accompanied by clinically evident pain.
• They typically arise as nodules firm, mobile, and tender-to-the-touch nodules, exhibiting hyperpigmented or reddish-brown coloration, with a diameter that rarely exceeds 2 cm and a smooth surface.
• While solitary lesions are predominantly located on the lower extremities, the pattern of appearance for multiple pilar leiomyomas occurs in any body region, following various distribution patterns. distribution.

Clinical Aspects of Angioleiomyoma

• Approximately 60%... [The original content cuts off here].