Primary Signet Ring Cell Carcinoma of the Lung: Report of Two Cases.
- Author:
Dong Ja KIM
1
;
Sook Hee LEE
;
Yoon Kyung SOHN
Author Information
1. Department of Pathology, Kyungpook National University, School of Medicine.
- Publication Type:Case Report
- Keywords:
Signet ring cell carcinoma;
Lung;
Carboxylated acid mucins
- MeSH:
Adenocarcinoma;
Carcinoma, Signet Ring Cell*;
Cytoplasm;
Epithelial Cells;
Lung*;
Microvilli;
Mucins;
Neoplasm Metastasis;
Prognosis;
Sputum
- From:Korean Journal of Cytopathology
1997;8(1):83-86
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
Signet ring cell carcinoma is a variant of adenocarcinoma and has been rarely reported in the lung as a primary site. Recently, we experienced two cases of primary signet ring cell carcinoma in the lung without any other extrapulmonary lesion. Sputum cytology was performed and the tumor cells which have eccentrically located nuclei and abundnat mucinous cytoplasm were dispersed in diffuse sheets. On resected specimen, the signet ring cells occupied about 50~80% of all tumor cell nests. HIstochemical staining revealed that the mucin produced by tumor cells was mostly carboxylated acid mucins. Ultrastructurally, the tumor cells contained variable sized membrane-bound mucin granules with weak central osmiophilic density and showed numerous surface microvilli, which represented that tumor cells arose from bronchial epithelial cells. In general, this tumor has diffusely infiltrative nature and the prognosis is fatal due to widespread metastasis before clinical discovery.
