Related Experiment Video
Updated: Feb 11, 2026
08:31
Bioprinting of Hydrogel Tumor Slices as a 3D Model for Mantle Cell Lymphoma
Published on: September 12, 2025
845
Plasmablastic lymphoma presenting as a ureteral polypoid mass.
Sohei Yamamoto1, Yuma Yasuda1, Yu Sakai1
1Department of Diagnostic Pathology, Anjo Kosei Hospital, Anjo, Japan.
Summary
Plasmablastic lymphoma (PBL), a rare B-cell cancer, can appear in the upper urinary tract of HIV-positive individuals. This case highlights PBL presenting as a ureteropelvic junction mass, mimicking urothelial carcinoma.
Area of Science:
- Oncology
- Urology
- Pathology
Background:
- Plasmablastic lymphoma (PBL) is an aggressive B-cell lymphoma subtype.
- PBL predominantly affects the oral cavity in human immunodeficiency virus (HIV)-positive individuals.
Observation:
- A case report details a 44-year-old HIV-positive patient with a solitary polypoid mass at the left ureteropelvic junction.
- The mass caused unilateral hydronephrosis and presented clinically as urothelial carcinoma.
Findings:
- Laparoscopic nephroureterectomy was performed for the ureteropelvic junction mass.
- Pathological examination confirmed the mass to be Plasmablastic Lymphoma (PBL).
Implications:
- PBL can manifest unusually, including as upper urinary tract masses.
- Consider PBL in the differential diagnosis for renal masses in HIV-positive patients.
Related Concept Videos
01:52Atomic Mass
70.5K
Atoms — and the protons, neutrons, and electrons that compose them — are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g. When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which...
70.5K
01:54Molar Mass
87.1K
The identity of a substance is defined not only by the types of atoms or ions it contains but by the quantity of each type of atom or ion. For example, water, H2O, and hydrogen peroxide, H2O2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms. However, because a hydrogen peroxide molecule contains two oxygen atoms, as opposed to the water molecule, which has only one, the two substances exhibit very different properties.
87.1K
02:56Formula Mass and Mole Concepts of Compounds
82.4K
Formula Mass of Covalent Compounds
82.4K
01:22Mass Concreting
358
Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
358
01:19Mass and Weight
15.4K
Mass and weight are often used interchangeably in everyday conversation. For example, medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the...
15.4K
01:12Atomic Number and Mass Number
17.2K
The number of protons in the nucleus of an atom is its atomic number (Z). This is the defining trait of an element. Its value determines the identity of the atom. For example, any atom that contains six protons is the element carbon and has the atomic number 6, regardless of how many neutrons or electrons it may have. A neutral atom must contain the same number of positive and negative charges, so the number of protons equals the number of electrons. This means that the atomic number also...
17.2K