Foetus in Foetu and the Retroperitoneal Teratoma

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Abstract
An attempt has been made to separate the charac-teristics of 2 interesting conditions, often confused in the past. A further illustrative case has been described, which in the author''s opinion was probably a foetus in foetu. Certain contradictions in the pathological description are evident. The internal histology of the specimen was manifestly teratomatous. Yet could this represent all that remained of the interior of a markedly reduced foetus ? It is sug-gested that it may still be difficult to identify correctly borderline instances of these conditions, unless very minute and painstaking examination of the fresh specimen is carried out.