Abstract: The data of clinical manifestations, ultrasound and pathological findings in patients with trichilemmal cysts in our hospital from February 2017 to February 2024 were retrospectively analyzed. A tall of 48 patients, including 27 males and 21 females, the average age was 44.4 years old. All the patients presented with solid subcutaneous nodules. Among them, 35 cases had nodules on the scalp, 8 cases on the face, 3 cases on the limbs, and 2 cases on the trunk. The ultrasound suggested that the morphology of 41 lesions was oval with clear boundaries; the morphology of 7 lesions was irregular with blurred boundaries; 38 lesions were of the “target ring” type; 10 lesions were of the hypoechoic type. Pathology showed cystic cavities in the dermis, the cyst walls were composed of squamous epithelial cells, without a granular layer, homogeneous eosinophilic keratinous substances were seen in the cystic cavities, and focal calcification foci were seen in some cases.

Key words: trichilemmal cysts, clinical manifestations, ultrasound, pathological features