Fetus in Fetu as a suprarenal mass in a neonate – a rare and perplexing entity
DOI:
https://doi.org/10.4322/acr.2021.347Keywords:
Biopsy, fine needle, Adrenal Glands, Teratoma, FetusAbstract
Fetus in fetu (FIF) is a rare entity in which a malformed vertebrate fetus is incorporated within its twin. This entity should be differentiated from a teratoma, which has more malignant potential. We describe a neonate with a heterogeneous calcified suprarenal mass. The aspiration cytology revealed a heterogeneous cell population with spindle cells and small round blue cells. Operative and histopathologic examination showed features consistent with a fetus in fetu. This case report describes a rare entity and discusses its clinical presentation, cytological features on fine-needle aspiration, and the difficulties posed in its differentiation from a teratoma.
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