title: Abnormal villous morphology mimicking a hydatidiform mole associated with paternal trisomy of chromosomes 3,7,8 and unipaternal disomy of chromosome 11.
abstract: BACKGROUND
  Pregnancies affected by non-molar chromosomal abnormality may sometimes demonstrate abnormal chorionic villous morphology that is similar to partial hydatidiform mole. Determination of the underlying aetiology may be difficult in such cases.
  
  
  METHODS
  This report describes a case referred to the regional trophoblastic disease unit as a possible hydatidiform mole that demonstrated both villous dysmorphology and abnormal p57(KIP2) expression. Molecular genotyping revealed that while most chromosomes in the villous tissue were diploid and biparental, chromosomes 3, 7 and 8 were trisomic with an additional paternally derived chromosome. In contrast chromosome 11 showed uniparental disomy of paternal origin a situation more usually associated with complete hydatidiform moles. This unusual case highlights that exceptions may occur to the general rules of both histological morphology and immunoprofile, and that these can be resolved by detailed molecular genetic investigations.
  
  
  CONCLUSIONS
  The findings confirm that trisomic pregnancies may demonstrate morphological villous features similar to hydatidiform mole, and that loss of p57(KIP2) expression occurs due to an absence of maternally transcribed genes on chromosome 11 and can therefore be independent of androgenetic complete hydatidiform mole.
authors: Trophoblastic Tumour Screening & Treatment Centre, Imperial College London, Charing Cross Campus, Fulham Palace Road, London, W6 8RF, UK. Neil.Sebire@gosh.nhs.uk.
authors: Neil J
authors: NJ
authors: Sebire
authors: Molecular Pathology Laboratory, Imperial College London, Hammersmith Campus, DuCane Road, London, W12 0NN, UK. philippa.may@imperial.ac.uk.
authors: Philippa C
authors: PC
authors: May
authors: Trophoblastic Tumour Screening & Treatment Centre, Imperial College London, Charing Cross Campus, Fulham Palace Road, London, W6 8RF, UK. Baljeet.Kaur3@imperial.nhs.uk.
authors: Baljeet
authors: B
authors: Kaur
authors: Trophoblastic Tumour Screening & Treatment Centre, Imperial College London, Charing Cross Campus, Fulham Palace Road, London, W6 8RF, UK. m.seckl@imperial.ac.uk.
authors: Michael J
authors: MJ
authors: Seckl
authors: Trophoblastic Tumour Screening & Treatment Centre, Imperial College London, Charing Cross Campus, Fulham Palace Road, London, W6 8RF, UK. r.fisher@imperial.ac.uk.
authors: Rosemary A
authors: RA
authors: Fisher
mesh_terms: D000328:Adult; D001706:Biopsy; D002824:Chorionic Villi / Q000473:pathology*; D002880:Chromosomes, Human, Pair 11; D002893:Chromosomes, Human, Pair 3; D002897:Chromosomes, Human, Pair 7; D002898:Chromosomes, Human, Pair 8; D003937:Diagnosis, Differential; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D006828:Hydatidiform Mole / Q000175:diagnosis* / Q000235:genetics / Q000473:pathology; D017404:In Situ Hybridization, Fluorescence; D025202:Molecular Diagnostic Techniques; D010641:Phenotype; D011237:Predictive Value of Tests; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis* / Q000235:genetics / Q000473:pathology; D014314:Trisomy; D024182:Uniparental Disomy; D014594:Uterine Neoplasms / Q000175:diagnosis* / Q000235:genetics / Q000473:pathology