The lymphatic system is composed of lymphatic vessels and lymphoid organs such as the thymus, tonsils, lymph nodes, and the spleen. These assist in acquired and innate immunity, in filtering and draining the interstitial fluid and in recycling cells at the end of their life cycle. The fluid that leaks from end-stage capillaries returns to the vascular system via the superficial and deep lymphatic vessels, which in turn drain into the right lymphatic duct and the thoracic duct. The right lymphatic duct travels on the medial border of the scalenus anterior muscle and drains the lymph from the right upper quadrant of the body. The thoracic duct starts at the cisterna chyli and has a highly variable anatomy. The right lymphatic duct and the thoracic duct drain into the right and left subclavian arteries, respectively, at the jugulovenous angle. Lymph nodes are found at the convergence of major blood vessels, and an adult will have approximately 800 nodes commonly sited in the neck, axilla, thorax, abdomen, and groin. These filter incoming lymph and play a role in infection as well as in malignancy. This paper will discuss the structure and function of lymph nodes, as well as the anatomical divisions of these.Caustic ingestions are severe causes of morbidity and mortality and can easily affect all age groups. 80% of the total cases of caustic ingestion in the United States occur in children. Caustic ingestions are cause for emergent treatment and requirement coordination between both surgical and medical therapies for best outcomes. Clinicians must be aware of common pitfalls and resources available to them. Most ingestions (especially in children) are non-toxic and may be managed at home, but immediate triage, rapid evaluation, and the timely institution of treatment are critical in producing favorable outcomes.Xanthogranulomatous pyelonephritis (XGP) is a rare and aggressive variant of chronic pyelonephritis resulting in a non-functioning kidney. It is most often associated with chronic obstruction and stones with ongoing infection. It is also referred to as a pseudotumor due to an enlarged kidney resembling a tumor and the ability of local invasion and destruction. The disease is characterized by the destruction and replacement of renal or peri-renal tissue with granulomatous tissue containing lipid-laden macrophages. The term "xantho" (Greek meaning yellow) is used in its name due to the infiltration of lipid-laden macrophages that appear yellow in the pathological section. XGP was first described by Schlagenhaufer in 1916 and was named as xanthogranuloma by Osterlin in 1944. Xanthogranulomatous pyelonephritis is often confused with a true neoplasm, most commonly renal cell carcinoma due to its similarity in clinical and radiographic features, as well as the ability to involve the adjacent structures or organs. Therefore, early identification and treatment are required to decrease the morbidity and mortality associated with this condition. Although antibiotics can be given in acute infection, the treatment of choice for XGP is nephrectomy. Classification (a) Diffuse Kidney involvement is diffuse. (b) Segmental Kidney involvement is segmental. (c) Focal Involvement within the cortex of the kidney.An aneurysm is an abnormal dilatation or bulging in a blood vessel due to the intrinsic weakness of the vessel wall. Aneurysms can affect any blood vessel, but they are most commonly seen in arteries rather than veins. An aneurysm can be a true aneurysm or false aneurysm. A true aneurysm has all the three layers of the arterial wall (intima, media, and adventitia). A false aneurysm, also known as pseudoaneurysm, involves the outer layer of the artery (adventitia). Depending on their shape, they can be saccular or fusiform. Cerebral aneurysms are 90% saccular aneurysms (also known as berry aneurysms), unlike aortic aneurysms, which are about 94% fusiform. Aneurysms can be classified based on their location in the body. Depending on the etiology can be dissecting or mycotic aneurysms. This review will focus on saccular cerebral and aortic aneurysms. Saccular cerebral aneurysms can also be classified by size (small 5 mm or less, medium 6 to 14 mm, large 15 to 25 mm, giant greater than 25 mm). Most cerebral aneurysms are asymptomatic and small, and they are found incidentally during brain imaging or during an autopsy. About 85% of cerebral aneurysms are located in the anterior circulation at the arterial bifurcations on the circle of Willis and the middle cerebral artery bifurcation. Most of the saccular aortic aneurysms are located in the descending thoracic aorta.Ataxia is the absence of voluntary muscle coordination and loss of control of movement that affects gait stability, eye movement, and speech. Spinocerebellar ataxia (SCA) is an inherited (autosomal dominant), progressive, neurodegenerative, and heterogeneous disease that mainly affects the cerebellum. https://www.selleckchem.com/products/bms303141.html SCA is a subset of hereditary cerebellar ataxia and is a rare disease. To date, more than 40 distinct genetic SCAs have been identified which are classified according to the genetic loci in order of identification. SCA1 was the first SCA described and then further subtypes are identified sequentially. SCA doesn't compulsorily mean that it is restricted to the cerebellum and spinal cord. It may involve the other parts of the central nervous system as well, such as pontine nuclei, spinal cord, peripheral nerves, cortex, basal ganglia, etc. SCA6 is restricted to the cerebellum whereas SCA2 spares cerebellum. Well defined and common types are SCA1, SCA2, SCA3, and SCA6 which accounts for more than half of cases and other rare variants constitute the remaining cases. SCA is very complex to understand both genotypically and phenotypically and very difficult to describe all variants at one time.Bursitis is the swelling or inflammation of a synovium-lined sac-like structure called a bursa. These are found throughout the body near bony prominences and between bones, muscles, tendons, and ligaments. They function to reduce friction between these structures. Inflammation of the bursa around large joints like the shoulder, knee, hip, and elbow may prompt patient visits to healthcare providers. There are four major bursae associated with the knee joint suprapatellar, infrapatellar, pes anserine, and prepatellar. This article will focus on the prepatellar bursa and, specifically, prepatellar bursitis. This bursa is present between the patella and the overlying subcutaneous tissue. It represents the most commonly affected bursae of the knee and the second most commonly affected bursa overall, following the olecranon bursa. The location makes it a target during repetitive kneeling and has led to it being colloquially referred to as housemaid's, carpet layers, and carpenter's knee.