MUC5AC and carcinoma: In view of the presence of cysts containing large pools of mucin and gelatinous areas in most documented cases of mucin-secreting adenocarcinoma, Raphael et al. [11] and Abbas et al. [2] suggest that diagnosing carcinoma in this circumstance requires a strong clinical suspicion and that an intraoperative frozen section study or cytology may help confirm the diagnosis and planning the appropriate surgery.