Cutaneous granular cell tumor: A case series, review, and update.

Background:Granular cell tumor (GCT) or Abrikossoff's tumor is an uncommon neuro-derived tumor in which Schwann cells are found and express S-100 protein. Often, it is a benign lesion. Histopathologically, there are granular cell infiltrations through the entire dermis without necrosis which are periodic acid Schiff (PAS) stain positive and reactive with S-100. The aim of this study is the clinicopathological evaluation of GCT. Material and Methods:In this paper, we described the experience of 6 patients with a GCT in different locations (4 cases in the skin and 2 cases in the mucosa), for example, a case with a tumor in the abdomen and a keloidal-like presentation with a highly sclerotic pattern (an uncommon pathological feature). Another case developed a lesion secondary to physical trauma. Result:In one case, the presence of a lesion in the lower lip associated with actinic damage secondary to chronic sun exposure resulted in misdiagnosis with actinic cheilitis and squamous cell carcinoma. Conclusion:Histopathologically, there were granular cell infiltrations through the entire dermis without necrosis which are PAS-positive and reactive with S-100.