Mammaglobin negative secretory carcinoma may be overlooked. It is important to assess the possibility of diagnosis when histology is suggestive and immunohistochemical staining for S-100 is positive even when staining for mammaglobin is negative.
Keywords: acinar cell carcinoma; carcinoma; head and neck neoplasms; salivary gland; submandibular gland.
© 2020 The Authors. Clinical Case Reports published by John Wiley & Sons Ltd.