case_images: PMC10848887_01
case_images: Neuroendocrine cells with fascicles of plump spindle cells separated by thin fibrovascular septa (blue arrow on the right and yellow arrow on the left)
case_images: cureus-0016-00000051862-i01.jpg
case_images: PMC10848887_01_cureus-0016-00000051862-i01.jpg
case_images: FIG1
case_images: Histological characteristics consist of clusters of neuroendocrine differentiated cells arranged in fascicles, exhibiting a plump spindle cell morphology and interspersed with delicate fibrovascular septa, consistent with neuroendocrine differentiated cells (Figure 1), and immunohistochemical markers positive for chromogranin A and synaptophysin .