Papillary region

For more distal portions of the nephron, passive concentration of xenobiotics can occur due to the physiologic concentrating mechanism that provides a favorable gradient for the xenobiotic to undergo back-diffusion into the papillary region of the kidneys [23]. 

The dermis is the largest layer of the skin. It is a region of strong and flexible connective tissue. The dermis consists of two primary layers, the papillary layer and the reticular layer. The papillary layer is the smallest layer of the dermis and is composed mainly of collagen and elastin fibers. The reticular layer is the largest layer of the dermis and is composed of mainly dense connective tissue. The layer of subcutaneous fat found directly beneath the dermis provides insulation and additional mechanical support to the skin. 

Local and loco-regional infections occur in cases of local overpeeling above all or after scratch lesions (Figure 37.45). Although peels to the papillary or reticular dermis are more likely to become infected, infections can nevertheless develop after a more superficial peel. 

Papillary necrosis is a form of chronic interstitial nephritis characterized by necrosis of the renal papillae, which are the regions of the kidney where the collecting ducts enter the renal pelvis. Analgesic use is the most common cause of papillary necrosis, accounting for 36% of all cases. ... 

Capillary damage in the papillary layer of the dermis was identified. The endothelial cells of capillaries in this region showed nuclear damage and vacuolation of their cytoplasm. Peri-capillary oedema was noted. Leukocyte dia-pedesis was seen in some capillaries but near the centre of the lesion blood vessels appeared contracted and empty. Lymphatic vessels in the dermis were dilated. 

Other forms of adenocarcinoma that occur in the ampullary region include mucinous adenocarcinoma, signet-ring cell adenocarcinoma, and invasive papillary carcinoma, which may mimic in situ neoplasia because of its exophytic growth, papillae formation,... 

PAPILLARY TUMOR OF THE PINEAL REGION (LIKELY GRADE II OR III)... 

The papillary tumor of the pineal region (PTPR) is a rare tumor found at all ages. It has a prealbumin- and CAM5.2-positive cuboidal epithelium wrapped around vessels and closely resembles a choroid plexus tumor. 

Hasselblatt M, Blumcke I, Jeibmann A, et al. Immunohistochemical profile and chromosomal imbalances in papillary tumours of the pineal region. Neuropathol Appl Neurobiol. 2006 32 278-283. 

Buffenoir K, Rigoard P, Wager M, et al. Papillary tumor of the pineal region in a child case report and review of the literature. Childs Nervous System. 2008 24 379-384. 

Table 53.5 Papillary follicular carcinoma ratio in nonendemic goiter regions with or without iodination policy...

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