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CASE REPORT
Papillary cystadenocarcinoma of the hard palate
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    Papillary Cystadenocarcinoma is a Unique Salivary Gland Tumor

    The authors state in the discussion that papillary cystadenocarcinoma (PAC) is not a rare tumor in the thyroid, ovary, or prostate. However, PAC is a unique cystic salivary gland tumor, and is not typically described in these locations1. There are few reports of PAC in the prostate, and they are possibly related to prostatic cystadenoma; however, it is not described as a salivary gland tumor in this location2. While papillary thyroid carcinomas can be cystic, the term PAC is not typically used in this location. A reference to a paper is included in the discussion afterwards, and is incorrectly cited as "papillary cystadenocarcinoma of the thyroid", when the actual article title is "papillary adenocarcinoma of the thyroid"3. Cystadenocarcinoma is a pattern described in ovarian tumors, on the other hand it is not currently mentioned in WHO classification of tumors of female reproductive organs4. Although PAC of the salivary gland is currently lumped under the heading of adenocarcinoma, NOS, survival is unique for these cystic tumors. They show rare recurrences with satisfactory surgical resection1. It should be important to acknowledge that PAC is a unique salivary gland tumor, and is distinct from cystic adenocarcinomas occurring in other organ sites.

    References
    1. El-Naggar AK, Chan JK, Grandis JR, Takata T, Slootweg PJ. WHO classification of head and neck tumours. International Agency for Research on Cancer; 2017.
    2. Lee T...

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    Conflict of Interest:
    None declared.