Chorionic bump in a pregnant patient with a history of infertility

Abstract

Chorionic bump is a rare condition in the first trimester of pregnancy. It appears as a bulge from the choriodecidual surface into the gestational sac. So far, there have been no ultrasound or clinical markers that can predict a difference in outcomeWe report a case of a pregnant woman with history of infertility, diagnosed in the first trimester with a chorionic bump. It disappeared spontaneously at 23 weeks of gestation. The pregnancy went well and she delivered a healthy baby.The aetiology and clinical significance of the chorionic bump remains unclear.

Chorionic Bump: Radiologic Features and Pregnancy Outcomes

“…It is significant to distinguish chorionic bump from subchorionic hemorrhage. The former is the choriodecidual membrane bulging into the gestational sac, whereas the latter is blood collection between chorion and deciduas [ 4 ]. It is a rare sonographic finding observed in the first-trimester obstetric ultrasound with a low incidence, from 1.5/1000 to 7/1000 pregnancies [ 5 ].…”

Chorionic bump at 11 to 13 weeks' gestation: Prevalence and clinical significance

“…This is true for the general population as well as for patients with a history of infertility treatment. A computerized search of the Pubmed/MEDLINE database using the term “chorionic bump” revealed six larger series describing between eight to 57 cases and eight isolated reports describing one or two cases. Our report adds an additional 23 cases, for a total of 190 cases reported in the English literature.…”

“…This led to the conclusion that this sonographic feature is associated with a guarded prognosis. 1 Until now, the vast majority of cases of chorionic bump have been detected in pregnancies presenting before 11 weeks' gestation, [1][2][3][4][5][6][7][8][9][10][11][12][13][14] with only one report including cases referred for nuchal translucency thickness measurements at 11 to 13 weeks' gestation. 9 However, the latter report was based on pregnancies with available cytogenetic studies, and neither specific clinical details nor pregnancy outcomes were reported.…”

A bump inside the bump: a case report of a chorionic bump

“…The chorionic bump can be distinguished from the subchorionic haemorrhage because they bulge from the choriodecidual surface into the gestational sac; in contrast, the subchorionic haemorrhage separates the chorionic membrane from the decidua. 6 The pilot study conducted by Harris et al 1 suggested that pregnancies with the finding of chorionic bump was associated with a lower live birth rate; however, subsequent studies 2,3,7 have not supported those earlier findings. The rarity of this sonographic finding creates a challenge for large scaled studies and a need for individual cases to be reported.…”

“…Harris et al also postulated that the chorionic bump may represent a resorbing blighted pregnancy; however, there is at present, no evidence for this theory. The chorionic bump can be distinguished from the subchorionic haemorrhage because they bulge from the choriodecidual surface into the gestational sac; in contrast, the subchorionic haemorrhage separates the chorionic membrane from the decidua …”