Melanocytic nevus of the anal canal and granular cell tumor of the cecum: a case report and literature review of 2 coincidentally co-occurring neurocristopathies.

Granular cell tumors are predominantly benign soft tissue tumors originating from Schwann cells, whereas melanocytic nevi are benign proliferations of melanocytes. We present the case of a patient with the presence of both entities located in the cecum and anal canal, respectively, constituting an extremely rare coincidental finding. A 43-year-old woman was evaluated by colonoscopy for iron-deficiency microcytic anemia that had lasted for 1 year. Colonoscopy demonstrated a macular lesion of 0.3 cm with a melanocytic appearance in the anal canal; at the cecum level, a subepithelial, yellowish, and partially mobile firm nodular lesion measuring 1.3 cm was observed. A histopathological study showed a melanocytic nevus in the anal canal and a granular cell tumor in the cecum. This is the first reported case of a patient with the extremely rare coincidental-incidental finding of these 2 entities at the same time.

Descripción anatómica del cráneo del gato / Anatomic Description of the Cat Skull

Resumen Este artículo tiene como propósito hacer un estudio descriptivo de las estructuras anatómicas del cráneo del gato doméstico (Felis catus). El cráneo, que deriva del griego kranos, "casco" o "yelmo", es una estructura de vital importancia en todo ser vivo vertebrado, debido a que en ella se aloja el encéfalo y los órganos de los sentidos, y es la entrada de órganos que conforman el aparato digestivo y respiratorio. El cráneo está conformado por una variedad de huesos que están fusionados o articulados entre sí y forman el esplacnocráneo y neurocráneo. No es mucha la literatura anatómica que existe en relación con el gato, a diferencia de lo que ocurre en caninos; por esta razón, una descripción en detalle de los segmentos óseos del esplacnocráneo y neurocráneo es un inicio a la profundización anatómica de esta especie.

Abstract This article aims to develop a descriptive study of the skull anatomic structures in home cats (Felis catus). The cranium -from the Greek kranos, "helmet" or "hood"- is a vital structure for every vertebrate living being because it provides the lodge to the encephalon and senses. It also provides the entrance organs to both the digestive and respiratory systems. The cranium is formed by an assortment of bones articulated or joined together thus forming the splanchnocranium and the neurocranium. There is not too much anatomic literature on the cat anatomy, unlike the canines. Therefore, a detailed description of the bone segments in the splanchnocranium and neurocranium is the starting point for an in-depth anatomic study of this species.