A 16-HOUR-OLD boy was found to have a scrotal mass, on his initial physical examination. Exploration at 18 hours of age revealed a necrotic appendix testis (hydatid of Morgagni). Torsion of the appendix testis has never been reported in the newborn, the youngest previously recorded case being at 11 months of age.1 This case is reported to record a rarity and to jog the awareness of those who care for the newborn.
The appendix testis was first descrived by Morgagni2,3 in 1761. Embryologically, it is the persistence, in the male subject, of the upper end of the mullerian duct, and is reported to be present in about 90% of all male subjects.4 It is found as a sessile or more frequently as a pedunculated structure arising from the superior pole of the testicle adjacent to the caput major of the epididymis, and varies in size from 0.1
Chiles DW, Foster RS. Torsion of the Appendix Testis in the Newborn: Initial Report of This Disorder in a Neonate. Am J Dis Child. 1969;118(4):652–654. doi:10.1001/archpedi.1969.02100040654023
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