Ultrasonographic Patterns and Pathological Correlation in the Diagnosis of Subcutaneous Nodules

Inclusion Criteria: * Patients aged 18 years and older who presented with subcutaneous nodules * Indicated for pathological examination for disease diagnosis. * Patients with subcutaneous nodules located in areas where a tissue sample can be taken down to the fat layer. * Patients who agree to participate in the project by signing the consent form. Exclusion Criteria: * Presence of inflammation or other tumors that can mimic panniculitis, such as painful lipomas, cellulitis, and leg interstitial edema. * Patients with diseases that significantly alter the structure of the skin or subcutaneous tissue, such as scleroderma or severe edema. * A history of previous treatments in the area of the subcutaneous mass (e.g., surgery, radiation therapy, or high-dose steroid treatment) that may interfere with ultrasound results. * Patients with lesions on the head or mucous membranes of the body. * Pregnant or breastfeeding patients. * Presence of wounds or open sores in the area to be examined with ultrasound. * A history of coagulopathy (blood clotting disorders). * Patients with metal implants in the area of interest that may interfere with ultrasound imaging. * Participants who refuse or withdraw from the study.