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Table 1 Distribution of published cases of FIF by site of occurrence (1806 to July 2008)

From: Orocervical foetus-in-foetu with prenatal sonographic diagnosis: a case report

Site of occurrence Frequency (n) Percentage (%) Valid percentage (%)
Intra-abdominal 94 55.3 80.3
Intracranial 12 7.1 10.1
Chest 3 1.8 2.5
Neck 3 1.8 2.5
Mouth 3 1.8 2.5
Scrotal sac 3 1.8 2.5
Sacral/pelvis 1 0.6 0.6
Missing* 51 30 100
Total 170 100 -
  1. *Missing is reported cases for which the abstract and the full paper could not retrieved or the abstract contains no information on the site of the FIF.