Aganglionic Megacolon Definition and Description of Aganglionic Megacolon Aganglionic megacolon, also known as Hirschsprung’s disease, is a congenital condition characterized by the absence of ganglion nerve cells in a segment of the large intestine (colon). This lack of neural tissue leads to impaired peristalsis—the coordinated muscle contractions that facilitate bowel movements. Consequently, the affected segment…
Agnogenic Myeloid Metaplasia (AMM) Definition and Description of Agnogenic Myeloid Metaplasia (AMM) Agnogenic Myeloid Metaplasia (AMM), often referred to as myelofibrosis, is a rare bone marrow disorder that disrupts the body’s normal production of blood cells. It is categorized as a type of chronic myeloproliferative neoplasm (MPN). In AMM, the bone marrow becomes fibrotic, leading…
Abscessed Tooth Definition and Description of Abscessed Tooth An abscessed tooth is a dental condition characterized by a pocket of pus that forms within the tissues surrounding a tooth as a result of a bacterial infection. This condition usually occurs due to untreated dental cavities, injuries to the teeth, or periodontal (gum) disease. An abscess…
Absence Seizure Definition and Description of Absence Seizure Absence seizures, also known as petit mal seizures, are a type of epileptic seizure characterized by brief lapses in awareness. These seizures typically last for a few seconds and may occur multiple times throughout the day. People experiencing absence seizures may appear to stare blankly into space…
Acantholysis Bullosa Definition and Description of Acantholysis Bullosa Acantholysis Bullosa is a rare dermatological condition characterized by the loss of connections between skin cells, leading to blistering and erosion of the epidermis. This condition is a type of pemphigus, where the body’s immune system erroneously attacks proteins essential for cell adhesion, resulting in a disturbance…
ACC — Agenesis of Corpus Callosum Definition and Description of ACC — Agenesis of Corpus Callosum Agenesis of Corpus Callosum (ACC) is a neurological condition characterized by the partial or complete absence of the corpus callosum, a crucial structure that connects the left and right hemispheres of the brain. This condition can occur either as…
ACH Definition and Description of ACH ACH, or Arachnoid Cysts of the Hemisphere, is a type of fluid-filled sac located within the brain or on its surface. These cysts develop in the arachnoid membrane, which encases the brain and spinal cord. Most commonly, they are benign and often discovered incidentally during neuroimaging done for other…
