What do you mean by pathological changes? Medical terminology.

2. Tissue biopsy: Take out the lesion tissue for pathological examination to determine the type and nature of the lesion.

The diagnosis of lesions usually requires doctors to carry out detailed physical examination, medical history inquiry and related examinations. Common methods for diagnosing lesions include:

1. Imaging examination: such as X-ray, CT, MRI, ultrasound, etc.

1. Tumor focus: This focus is usually caused by abnormal cell proliferation. Tumor focus can be benign or malignant, and malignant tumor focus is one of the main forms of cancer.

2. Tissue biopsy: Take out the lesion tissue for pathological examination to determine the type and nature of the lesion.

3. Infarction focus: This focus is usually due to the interruption of blood supply caused by vascular obstruction. Infarction usually occurs in important organs such as heart and brain.