BACKGROUND: @entity189 ( @entity189 ), a recently described entity, is an @entity43 with a distinctive histologic architecture that lacks a destructive infiltrative growth pattern and behaves like a low-grade @entity5 . The purpose of this study was to determine if specific cytomorphologic features were associated with this @entity5 in peritoneal/ pelvic washings. METHODS: Eight cases of @entity189 were retrieved from the cytopathology files at The Johns Hopkins Hospital. @entity1 ranged in age from 31 to 74 years (mean, 58 years). A cytomorphologic comparison was made with pelvic washings of eight cases of @entity1377 ( @entity1377 ) of the ovary. RESULTS: @entity189 demonstrated small but well formed papillary fragments (generally < 30 cells) composed of monotonous, relatively small epithelial cells, often with multiple nucleoli. Single, large atypical cells were seldom present and were seen in less than one half of cases. Cellularity was generally high and slide background was clear with minimal inflammatory cells. In comparison, @entity1377 , in addition to the smaller papillary fragments, also exhibited larger more complex papillary fragments (generally > 30 cells) composed of pleomorphic, hyperchromatic cells often with single prominent nucleoli. Single, large @entity5 cells exhibiting eccentric atypical nuclei or multinucleation were present in high concentration in the majority of PSCs. Psammoma bodies were observed in one half of cases in both @entity5 types. CONCLUSIONS: Although @entity189 shares cytomorphologic similarities with @entity1377 , it can be diagnosed adequately in peritoneal/ pelvic washings. Careful interpretation of the subtle cytologic differences seen in the two @entity5 types may facilitate the differentiation of these @entity5 for a more appropriate management of the @entity1 .

XXXX : cytomorphologic characteristics in peritoneal/pelvic washings.

@entity43 :: ('MESH:D010051', 'Disease') :: ['ovarian tumor'] @entity1 :: ('9606', 'Species') :: ['Patients', 'patient'] @entity1377 :: ('MESH:D002291', 'Disease') :: ['PSC', 'papillary serous carcinoma'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'neoplasms', 'neoplasm'] @entity189 :: ('MESH:D002277', 'Disease') :: ['MPSC', 'Micropapillary serous carcinoma']
@entity43 :: (MESH:D010051,Disease) :: ['Micropapillary serous carcinoma of the ovary']
