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More from arppress.org/books/book/67: The organ of Chievitz, which lies along the lingual posterior mandible, is a neuroepithelial structure that should *not* be confused for perineural invasion by squamous cell carcinoma. #ENTpath #HNpath

Hot off the press from arppress.org/books/book/67: Embryonal rhabdomyosarcoma (RMS) is the most common type of RMS of the head and neck; submucosal tumors classically display a “cambium zone” of increased cellularity immediately below the epithelium. #ENTpath #HNpath #BSTpath

A preview from the new Series 5 fascicle: Tumors of the Upper Aerodigestive Tract, Ear, and Jaw (arppress.org/books/book/67): Granular cell tumor is a benign neuroectodermal tumor that can be accompanied by overlying pseudoepitheliomatous hyperplasia (second image set; not to be…

We're so excited for this! Stay tuned, coming soon.

More from arppress.org/books/book/42: Diverticula can affect the vermiform appendix (incidence <2%); this can simulate appendiceal mucinous neoplasms, especially when they rupture or display post-inflammatory mucosal hyperplasia (second set of images). #GIpath

More from arppress.org/books/book/42: Esophageal duplication cysts are congenital cysts that contain a muscular wall and various mucosal elements that may or may not have a connection to the lumen. These can bulge into the lumen and produce endoscopically apparent semispherical…

More on non-neoplastic #GIpath (arppress.org/books/book/42): Melanosis coli is associated with senna-containing compounds and other plant glycosides, and is usually an incidental finding during colonoscopy. It's less pronounced in adenomas (image A).

More on non-neoplastic #GIpath (arppress.org/books/book/42): Actinomyces israelii (a gram-positive, anaerobic, filamentous bacterium) is part of the normal intestinal flora, and can be an occasional cause of acute appendicitis. Yellow or brown "sulfur granules" (seen histologically…

More on non-neoplastic #GIpath (arppress.org/books/book/42): Acquired pyloric stenosis results in gastric outlet obstruction, most often due to healed gastric or duodenal ulcers, neoplastic infiltration by carcinoma or lymphoma, or postoperative adhesions.

We're now revisiting our series 5 fascicle "Non-Neoplastic Disorders of the Gastrointestinal Tract" (arppress.org/books/book/42): A duplication cyst is a tubular or cystic structure (with all layers of the intestinal wall) that is contiguous with the small bowel or colon; it has a…

From arppress.org/books/book/36: Abruption is the premature separation of the placenta from the decidua by maternal hemorrhage (after 20 weeks), usually due to vascular or decidual injury due to hypertension, inflammation, or trauma. #PerinatalPath #GynPath

More on placenta (arppress.org/books/book/36): Decidual arteriopathy is associated with maternal hypertensive disorders; the most common form consists of fibrinoid necrosis of the vascular wall, frequently with a mononuclear cell perivasculitis. #PerinatalPath #GynPath

More on placentas (arppress.org/books/book/36): Microscopic chorionic pseudocysts (aka chorionic membrane microcysts) are small eosinophilic fluid-filled pseudocysts in the chorion laeve, thought to be secretory or degenerative in nature. #PerinatalPath #GynPath

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More on placentas (arppress.org/books/book/36): Amnion nodosum is grossly seen as nodules studding the membranes and consists of amniotic surface deposits of fetal squamous cells/necrotic debris, and is associated with oligohydramnios. #PerinatalPath #GynPath

More from the placenta fascicle (arppress.org/books/book/36): Marginal insertion of the umbilical cord (<2 cm from the margin, but not in the membranes) is associated with fetal risks. This insertion type is increased in prevalence in/with: short umbilical cord, vaginal bleeding…

More on placental pathology (arppress.org/books/book/36): Amniotic bands are strips of amnion detached from the chorion, and are rare complications of pregnancy. They can be harmless, or may lead to complications and deformations. They can contain squamous cells from the amniotic…