Primary Cutaneous Mucinous Carcinoma on Facial:A Case Report
A 69-year-old man presented with a right facial mass for more than 8 years.Eight years ago,the patient developed a mass on the right side of the face without obvious cause.There was no redness,swelling,or pain.The patient had a history of rheumatoid arthritis for 13 years.Physical examination showed that the general condition was acceptable,and the superficial lymph nodes of the whole body were not palpable.Joint deformities of the extremities,especially the lower limbs,were knee-flexed,with limited movement and no edema.Skin examination revealed a 3.5 cm × 4.0 cm red mass on the right side of the zygomatic region.The mass had dilated blood vessels on the surface,medium texture,and good mobility,without tenderness or fluctuation.Histopathological examination showed that the tumor tissue was located in the dermis and consisted of tumor cell clusters of different sizes floating in a mucus lake.Immunohistochemical study showed diffuse positivity for cytokeratin 7(CK7),cystic disease fluid protein-15(GCDFP-15),and Ki67 positive index of 5％-10％.Syn,CgA,S100 and CK20 were all negative.The diagnosis was primary mucinous carcinoma of the skin.The tumor was resected and no recurrence was found during follow-up.
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