Background Microcystic adnexal carcinoma (MAC) is a rare skin neoplasm that has not been characterized on molecular basis. Aim To assess expression profiles of Hedgehog (HH) signalling molecules in MAC and control tumours. Methods Immunohistochemistry was performed for Sonic (SHH), Indian (IHH), Patched 1 (PTCH1) Smoothened (SMO) patient tissue (n = 26) tumour tissue, including syringoma (SyG; ...