Adnexal and skin appendage neoplasms Tags: Disease.Adnexal and skin appendage neoplasms is a group of tumors.An example is hidrocystoma.Please click on show to the right of the v.d.e links below to see a fuller list of lesions which fall within the realm of adenxal and skin appendage neoplasms. ICDO 8390-8429 MeSH ID D018294 Learn more... Loading...