SOLID CELL NEST Figure 3-5 SOLID CELL NEST Solid cell nest in a thyroglossal duct cyst. These ultimobranchial body rests are made up of polygonal to oval cells with oval nuclei and granular chromatin. More

ECTOPIC THYROID TISSUE Figure 3-8 ECTOPIC THYROID TISSUE Left: Ectopic thyroid tissue in a thyroglossal duct remnant shows colloid follicles with cuboidal epithelium. Right: This tissue may be mistaken for metastatic thyroid carcinoma; however, the cytologic features are benign. More

THYROGLOSSAL DUCT CYST Figure 3-9 THYROGLOSSAL DUCT CYST Contrast-enhanced sagittal (left) and axial (right) computerized tomography (CT) scans show a fluid-density structure in the soft tissues of the anterior neck (arrowheads). The cyst is intimately associated with the hyoid bone (arrow) as is... More

THYROGLOSSAL DUCT CYST Figure 3-10 THYROGLOSSAL DUCT CYST Left: Histologic section shows the cyst lined by epithelium, with lymphocytic inflammation in the cyst wall. Right: Ciliated respiratory epithelium lining a thyroglossal duct cyst. More

EPIDIDYMIS Figure 2-22 EPIDIDYMIS Left: The epididymal head consists largely of the efferent ductules, which show the characteristic undulating luminal surfaces. Right: The epididymal body and tail are composed of the highly convoluted epididymal duct, which is seen as multiple cross sections of... More

DUCTAL ADENOCARCINOMA OF PROSTATE METASTATIC TO TESTIS Figure 10-5 DUCTAL ADENOCARCINOMA OF PROSTATE METASTATIC TO TESTIS This prostatic ductal adenocarcinoma grows extensively in dilated channels of the rete testis and raised concern for a primary carcinoma of the rete. More

SPERM GRANULOMA Figure 11-84 SPERM GRANULOMA A: Within the epididymis, there is a large ruptured duct with inspissated aggregates of basophilic, degenerated spermatozoa surrounded by a myofibroblastic reaction. B: At high magnification, there are congealed sperm with an associated histiocytic an... More

TESTICULAR DUCTS: PAX8 EXPRESSION Figure 2-56 TESTICULAR DUCTS: PAX8 EXPRESSION Left: Nuclear reactivity is seen in the rete testis but not in the seminiferous tubules (bottom). Right: The epithelium of the vas deferens shows expression. More

TESTICULAR EMBRYONIC REMNANTS Figure 2-10 TESTICULAR EMBRYONIC REMNANTS A diagram of the adult testis shows the location of remnants derived from mesonephric tubules (paradidymis, superior and inferior ductuli aberrantes [or vasa aberrantes]), the mesonephric duct (the appendix epididymis), and t... More

EMBRYOLOGY OF TESTIS Figure 2-9 EMBRYOLOGY OF TESTIS Those mesonephric tubules (left) that persist are known as the epigenital tubules. They connect with the tubules of the rete testis and become the efferent ductules of the epididymis (right), comprising the head of the epididymis. The remaining... More

PREPUBERTAL-TYPE TERATOMA Figure 5-15 PREPUBERTAL-TYPE TERATOMA Organoid pancreatic differentiation consists of ducts, acinar tissue, and islets of Langerhans. More

PARATESTICULAR SMOOTH MUSCLE HYPERPLASIA Figure 11-41 PARATESTICULAR SMOOTH MUSCLE HYPERPLASIA A nodular proliferation of smooth muscle is unassociated with a duct and resembles a leiomyoma. More

TERATOMA, POSTPUBERTAL TYPE Figure 4-171 TERATOMA, POSTPUBERTAL TYPE Liver-like differentiation with macrovesicular fatty change is seen in this tumor. A small bile duct is present (upper right). More

TESTICULAR ANATOMY Figure 2-15 TESTICULAR ANATOMY The seminiferous tubules form continuous loops that drain into the rete testis via the straight tubules. The efferent ductules coil to form the epididymal head; and the convoluted epididymal duct comprises its body and tail. (From https://www.ear... More

EPIDIDYMITIS NODOSA Figure 11-99 EPIDIDYMITIS NODOSA Left: Epididymitis nodosa is the analogous lesion to vasitis nodosa in the epididymis. In this case, a cluster of small tubules (top) is juxtaposed to normal but dilated ducts (bottom). Right: At higher magnification, there are crowded small t... More

HYALINE GLOBULES IN EPIDIDYMAL EPITHELIUM Figure 11-16 HYALINE GLOBULES IN EPIDIDYMAL EPITHELIUM Left: The epididymal epithelium contains hyaline globules, variably referred to as Paneth cell-like metaplasia or coarse granular cytoplasmic change. Right: At higher magnification, a normal-appearin... More