This case report aimed to describe the first documented case of acephaly in an aborted lamb fetus from the Cajamarca region. The case involved a fetus lamb of the Creole breed from an extensive farming system, which underwent a postmortem macroscopic examination complemented by ultrasonographic and radiographic evaluations. The evaluation confirmed a severe congenital cranial malformation, characterized by the absence of definable craniofacial skeletal structures. Radiographic analysis was decisive in confirming this finding, revealing only a small residual bony structure at the cranial extremity of the cervical column, articulated with a normally developed vertebral column. An additional external malformation was observed, consisting of the fusion of the auricles and the absence of auditory canals in the cervical region. It is concluded that this report constitutes a precedent for local veterinary medicine, contributing to the documentation of the congenital cranial malformations in lambs.

To Cite This Article: Cueva-Rodríguez M, Tasilla-Quispe F, Portal-Torres J, Reyna-Cotrina G, Zambrano L, Quilcate-Pairazamán C and Alvarado W, 2026. First report of acephaly in a lamb from the Cajamarca region, Peru. Pak Vet J, 2026, 46(10): 2647-2653. http://dx.doi.org/10.29261/pakvetj/2026.235