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Related Concept Videos

Conditioned Taste Aversion01:14

Conditioned Taste Aversion

117
Conditioned taste aversion, also known as sauce béarnaise syndrome, is a phenomenon in which an individual develops an aversion to a certain food taste following a negative experience, typically illness. This form of aversion is a type of classical conditioning in which the taste of the food (conditioned stimulus, CS) is associated with the experience of illness (unconditioned stimulus, UCS).
A notable characteristic of conditioned taste aversion is that it often requires only a single...
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Hypersensitivities01:30

Hypersensitivities

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Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
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Allergic Drug Reactions01:27

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Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing...
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The Physiology of Taste01:24

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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
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Taste Buds and Receptors01:20

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Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
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New Methods to Study Gustatory Coding
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Atypical Type 2 Lepra Reaction Masquerading as Recurrent Sweet Syndrome.

Seraphima Sidhom1, Eric Yang2, Asha Gowda2

  • 1Michigan State College of Human Medicine, East Lansing, Michigan, USA.

Journal of Cutaneous Pathology
|December 5, 2024
PubMed
Summary

Erythema nodosum leprosum (ENL) can mimic Sweet syndrome, presenting with similar symptoms. Early diagnosis of ENL in patients with a history of travel and leprosy contact is crucial for effective treatment.

Keywords:
Sweet syndromedermatopathologyerythema nodosum leprosum

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Area of Science:

  • Dermatology
  • Infectious Diseases
  • Immunology

Background:

  • Erythema nodosum leprosum (ENL) is an immune complex-mediated condition associated with Mycobacterium leprae infection.
  • ENL presents with systemic symptoms like fever and arthralgias, alongside characteristic tender cutaneous lesions.
  • ENL shares clinical and histological similarities with Sweet syndrome (SS), necessitating careful differentiation for appropriate management.

Observation:

  • A 65-year-old male traveler presented with fever and edematous plaques, initially diagnosed as SS and treated with corticosteroids.
  • The patient experienced symptom recurrence, prompting further investigation.
  • A contact's subsequent leprosy diagnosis raised suspicion for ENL.

Findings:

  • Repeat staining and tissue PCR confirmed the presence of Mycobacterium leprae.
  • The case highlights the diagnostic challenge of ENL mimicking SS.
  • Timely and accurate diagnosis relies on considering ENL in patients with a relevant travel history and Sweet-like presentations.

Implications:

  • This case emphasizes the importance of considering ENL in the differential diagnosis of Sweet syndrome-like presentations, particularly in individuals with a history of travel to endemic areas.
  • The findings underscore the necessity of utilizing repeat staining and molecular diagnostic techniques for definitive ENL diagnosis.
  • Accurate diagnosis is critical for initiating appropriate treatment and preventing complications associated with leprosy and ENL.