Unusual patterns of cutaneous sebaceous neoplasms

This review discusses unusual and rare microscopic images that may be observed in cutaneous sebaceous neoplasms, including labyrinthine–sinusoidal, ‘rippled’ and carcinoid-like growth patterns. Other unusual features that may be diagnostically problematic are considered, along with ectopic sebaceous lesions and cutaneous-type sebaceous neoplasms arising outside the skin.