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. 2021 Oct 30;17:343. doi: 10.1186/s12917-021-03048-9

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 4 — Sagittal CT image sections of left maxillary cheek teeth and adjacent sinusoidal structures. a – c Section plane moving from buccal to medial; 0.6 mm slice thickness; W3100/C500. a Osteolytic loss of sinusoidal lamina dura of the buccodistal root of 209 (open arrowheads) and resulting apicosinusoidal fistulation with rostral maxillary sinus showing soft tissue/ fluid dense filling (asterisk). Normal pneumatized caudal maxillary sinus (CMS). Widening of periodontal space buccomesial root of 209 (arrowhead). b Gas inclusions in the buccomesial pulp and apical end of the buccodistal pulp (arrowheads). The periodontium at the buccodistal root of 209 shows severe periapical bone loss and inflammatory enlargement of periodontal space (open arrowheads). Slight central infundibular cement loss of the mesial infundibulum 209 (asterisk). Normal trabecular appearance of interalveolar bone between 207/208 and sclerosis between 208/209 (arrows). c Subocclusally, the severely enlarged mesial infundibulum of 209 shows missing infundibular cement (hypoplasia) and filling with heterogenic hypodense material and gas (asterisk). Missing enamel lining of the infundibular fundus (arrowheads), while e.g. parietal infundibular enamel is still present (arrow). Severe periapical bone loss and enlargement of the periodontal space (open arrowheads)