Calcified maxillary cyst secondary to a foreign-body reaction at the site of a remote tooth extraction.

Unilateral sinus disease has a wide differential diagnosis. When a patient has a history of maxillary dental work on the same side as the sinusitis, a foreign entity introduced during or subsequent to the dental manipulation must be considered. We present a case of calcified maxillary cyst that was discovered at the site of a remote tooth extraction. Pathologic analysis revealed the presence of vegetable matter within the cyst. To the best of our knowledge, no case of a maxillary cyst secondary to vegetable matter has been previously reported in the literature.