Is Pathological Exam for Disorders of the Appendix Testis Necessary?

Testicular appendages are remnants of embryologic structures commonly encountered during pediatric operations. The literature is vague on the management of incidentally discovered testicular appendages found intraoperatively. We performed a retrospective review of 93 pediatric patients who were found to have an incidental testicular appendage during inguinal hernia repair, cryptorchidism, or testicular torsion cases from December 2017 to June 2020. 100% of the incidental testicular appendage pathology results were benign. All of the specimens were 1.0 cm or less in their largest dimension. Removal of these specimens is considered the standard of care at our institution to help prevent torsion of the testicular appendage, which is one of the leading causes of acute scrotum in children. The authors of this study argue that pathological analysis is unnecessary and may result in excessive use of resources without proven benefit.

Are soil mite assemblages structured by the identity of native and invasive alien grasses?

Associations between plants and animals in aboveground communities are often predictable and specific. This has been exploited for the purposes of estimating the diversity of animal species based on the diversity of plant species. The introduction of invasive alien plants into an ecosystem can result in dramatic changes in both the native plant and animal assemblages. Few data exist at the species level to determine whether belowground animal assemblages share the same degree of association to plants. The hypotheses that soil mites (Acari) form assemblages specifically associated with different native grass species in an unmanipulated natural ecosystem and that invasive alien grasses will impact soil mite assemblage composition in this setting were tested. Soil mites sampled beneath five native and two invasive alien species of grasses at the Konza Prairie Biological Station, Kansas, USA, were similarly abundant, species rich, diverse, and taxonomically distinct. No mite species had affinities for a specific grass species. There was no evidence from analysis of similarity, canonical correspondence analysis, or a nonparametric assemblage analysis that the assemblage composition of soil mites was specific to grass species. Results suggest that soil mite assemblages were more related to characteristics of the plant assemblage as a whole or prevailing soil conditions. The most recent invasive alien grass did not support a successionally younger mite fauna, based on the ratio of mesostigmatid to oribatid mites, and neither of the two invasive grasses influenced mite assemblage structure, possibly because they had not yet substantially altered the soil environment. Our results suggest that extrapolations of soil mite diversity based on assumptions of plant specificity would be invalid.