Related Experiment Video
Updated: May 31, 2026
05:44
Skin Biopsy for Diagnosing Discoid Lupus Erythematosus
Published on: June 10, 2025
Generalized eruptive histiocytosis mimicking leprosy
B C Sharath Kumar1, A S Nandini, S R Niveditha
1Department of Dermatology, Kempegowda Institute of Medical Sciences, Bangalore, India. drsharath96@yahoo.com
Summary
Generalized eruptive histiocytosis (GEH) is a rare skin condition. This case highlights the importance of accurate diagnosis, differentiating GEH from leprosy through clinical and pathological analysis.
Area of Science:
- Dermatology
- Histiocytosis
- Immunohistochemistry
Background:
- Generalized eruptive histiocytosis (GEH) is a rare histiocytic disorder affecting adults.
- It presents as symmetric papules and nodules on the face, trunk, and extremities.
- GEH is classified under type IIa histiocytic disorders, involving dermal dendrocyte lineage.
Observation:
- A middle-aged woman presented with generalized asymptomatic papules and nodules.
- Initial treatment was for leprosy due to clinical mimicry, prevalent in India.
- Newer lesions exhibited features of progressive nodular histiocytosis.
Findings:
- Clinical, histopathological, and immunohistochemical correlations were crucial for diagnosis.
- The patient was ultimately diagnosed with Generalized eruptive histiocytosis.
- Distinguishing GEH from lepromatous leprosy is essential for appropriate management.
Implications:
- Accurate differentiation of GEH from other histiocytic disorders and leprosy is vital.
- This case underscores the need for comprehensive diagnostic approaches.
- Understanding GEH presentation aids in timely and correct patient treatment.
Related Concept Videos
01:30Leishmaniasis
Leishmaniasis is a protozoal disease caused by species of the genus Leishmania and transmitted through the bite of infected female sandflies. The parasite exists in two principal morphological forms during its life cycle. A sandfly acquires intracellular amastigotes from an infected reservoir host, such as a dog. Within the sandfly, these forms differentiate into motile, flagellated promastigotes. During a subsequent blood meal, promastigotes are injected into the human host, where they...
01:31Pulmonary Tuberculosis III
Tuberculosis (TB) is a contagious infection primarily affecting the lung parenchyma but which can also affect other body parts. TB can be classified based on disease development, presentation, and the affected anatomical site.
The first classification is based on the development of the disease, and it includes the following categories:
The first classification is based on the development of the disease, and it includes the following categories:
01:28Pulmonary Tuberculosis II
Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
01:26Rocky Mountain Spotted Fever
Rocky Mountain Spotted Fever (RMSF) is a severe tick-borne illness caused by Rickettsia rickettsii, a Gram-negative, coccobacillary bacterium. This pathogen is an obligate intracellular parasite, requiring a host cell for replication. Transmission occurs through the bite of an infected tick. In the United States, the most important vectors are Dermacentor variabilis (American dog tick) and Dermacentor andersoni (Rocky Mountain wood tick), though other tick species may also serve as vectors.
01:24Graves Disease II: Pathophysiology
Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...
01:01Hypersensitivity Reactions: Cytolytic Reactions
Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...