Abstract
Objectives: To describe the histologic features that are helpful in the diagnosis of the rare bronchiolar adenomas/ciliated muconodular papillary tumors (BAs/CMPTs) during intraoperative consultation. Methods: Multi-institutional retrospective review of frozen sections of 18 BAs/CMPTs. Results: In 14 of 18 cases, BA/CMPT was the primary reason for sublobar lung resection, and in 4 cases, BA/CMPT was an incidental finding intraoperatively for resections performed for carcinoma in other lobes. There were 11 proximal-Type/classic BAs/CMPTs and 7 distal-Type/nonclassic BAs/CMPTs. Only 3 (16.7%) of 18 were correctly diagnosed at the time of frozen section, all of which were proximal type/classic. The remainder were diagnosed as adenocarcinoma (n = 7); invasive mucinous adenocarcinoma (n = 1); non-small cell lung carcinoma (n = 1); cystic mucinous neoplasm, favor adenocarcinoma (either mucinous or colloid type) (n = 1); favor adenocarcinoma, cannot exclude CMPT (n = 1); atypical proliferation (n = 2); mucinous epithelial proliferation (n = 1); and mucous gland adenoma (n = 1). Conclusions: BA/CMPT can potentially be misdiagnosed as carcinoma during intraoperative consultation. On retrospective review of the frozen sections, the presence of the following may help to avoid misdiagnosis: A mixture of bland ciliated columnar cells, mucinous cells, and, most important, a basal cell layer, as well as a lack of necrosis, significant atypia, and mitoses.
Original language | English (US) |
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Pages (from-to) | 832-844 |
Number of pages | 13 |
Journal | American journal of clinical pathology |
Volume | 155 |
Issue number | 6 |
DOIs | |
State | Published - Jun 1 2021 |
Keywords
- Biopsy
- Bronchiolar adenoma
- Ciliated
- Frozen
- Lung
- Muconodular
- Papillary
ASJC Scopus subject areas
- Pathology and Forensic Medicine