Squamous intraepithelial lesion

Squamous intraepithelial lesion (SIL) is a term used in Pap smear reporting in the Bethesda system. It refers to abnormal changes in the cells on the surface of the cervix. The changes can be either low-grade (LSIL) or high-grade (HSIL), depending on the extent of the abnormality.

Classification

Squamous intraepithelial lesions are classified into two types:

• Low-grade squamous intraepithelial lesion (LSIL): LSIL suggests that the cells are mildly abnormal. It is usually caused by an HPV infection that often clears on its own.
• High-grade squamous intraepithelial lesion (HSIL): HSIL suggests more serious changes in the cells and indicates a higher risk of progression to cervical cancer if not treated.

Causes

The primary cause of squamous intraepithelial lesions is infection with certain types of HPV. There are over 100 different types of HPV, but only a few are known to cause SIL.

Diagnosis

Diagnosis of SIL is typically made through a Pap smear, which is a screening tool used to detect precancerous and cancerous processes in the endocervical canal of the female reproductive system.

Treatment

Treatment for SIL depends on the grade of the lesion. LSIL often clears on its own without treatment, while HSIL may require more aggressive treatment to prevent progression to cervical cancer.

See also

• Cervical cancer
• Human papillomavirus
• Pap smear
• Bethesda system

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