title: Pregnancy luteoma with granulosa cell proliferation: an unusual hyperplastic lesion arising in pregnancy and mimicking an ovarian neoplasia.
abstract: A pregnancy luteoma (PL) was incidentally found at a term cesarean section in a 27-year-old black woman without any endocrine abnormality. The lesion involved only the left ovary; it had a nodular and focal pseudoalveolar growth pattern and was associated with areas of tubular sertoliform component, consistent with granulosa cell proliferation. Immunohistochemistry revealed a diffuse positivity to Inhibin A, CD99, cytokeratin and vimentin. The ultrastructure was typical of steroid-producing cells. PL is a tumor-like lesion arising in pregnant women and often misdiagnosed as a neoplastic lesion; awareness of this rare entity and its differential diagnoses may avoid unnecessary surgery in young patients.
authors.affiliation: Department of Morphological Sciences and Forensic Medicine, University of Modena and Reggio Emilia, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Piana
authors.forename: F F
authors.initials: FF
authors.lastname: Nogales
authors.forename: S
authors.initials: S
authors.lastname: Corrado
authors.forename: L
authors.initials: L
authors.lastname: Cardinale
authors.forename: D
authors.initials: D
authors.lastname: Gusolfino
authors.forename: F
authors.initials: F
authors.lastname: Rivasi
mesh_terms: D000071443:12E7 Antigen; D000328:Adult; D015703:Antigens, CD / Q000032:analysis; D014408:Biomarkers, Tumor / Q000032:analysis; D015815:Cell Adhesion Molecules / Q000032:analysis; D002455:Cell Division; D003937:Diagnosis, Differential; D005260:Female; D006107:Granulosa Cells / Q000737:chemistry / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D007265:Inhibins / Q000032:analysis; D018311:Luteoma / Q000737:chemistry / Q000175:diagnosis*; D010051:Ovarian Neoplasms / Q000737:chemistry / Q000175:diagnosis*; D011247:Pregnancy; D011252:Pregnancy Complications, Neoplastic / Q000175:diagnosis*
chemical_list: D000071443:12E7 Antigen; D015703:Antigens, CD; D014408:Biomarkers, Tumor; C061828:CD99 protein, human; D015815:Cell Adhesion Molecules; D007265:Inhibins