Author: Dr Harriet Cheng BHB, MBChB, Dermatology Registrar, Waikato Hospital, Hamilton, New Zealand; Duncan Lamont, Department of Pathology, Waikato Hospital, Hamilton, New Zealand; Patrick Emmanuel, Dermatopathologist, Auckland, New Zealand, 2013.
Glomus tumours are painful. They arise from the neuromyoarterial glomus cells found in the fingers and palms. The normal counterpart from which these tumours arise is the Suquet-Hoyer canal. The clinical lesion is a solitary 1-2 cm reddish blue papule in a young adult.
Histology of glomus tumours
Glomus tumours are dermal, well circumscribed and consist of small vessels surrounded by glomus cells (Figure 1). Glomus cells have bland round to oval nuclei, pale eosinophilic cytoplasm and clearly defined cell margins (Figure 2, 3, 4). Mitotic figures and pleomorphism should not be prominent.