Ultrasound Features of Nodular Hidradenoma: A Case Series of 27 Patients.

Objective: The aim of this study was to systematically investigate the ultrasonographic features of nodular hidradenoma (NH).

Methods: A retrospective analysis was used to systematically summarize the ultrasonographic data of 27 patients diagnosed with NH by surgical pathology, including 13 eccrine nodular hidradenomas (ENH) and 14 apocrine nodular hidradenomas (ANH).

Results: All instances of NH presented as solitary, well-defined lesions that infiltrated the dermis and subcutaneous fat layer, characterized by a heterogeneous hypoechoic internal solid component on ultrasound imaging.