9 results
Paracoccidioides brasiliensis Lymphadenitis: 

Paracoccidioidomycosis is a systemic fungal infection rare in the US, but endemic in
Head&neck, Lymph ... Nodes, and lungs ... Lymph node entirely ... seen within giant cells ... Lymphadenitis #Pathology #LymphNode
Inflammatory mechanism of asthma. 
Airway epithelial cells exposed to activation stimuli, including allergens, viruses, and irritants,
promote dendritic cell ... mobilization to draining lymph ... nodes, where they ... These T cells then ... #inflammatory #immunology
Humoral Immunity - Pathogenesis and Clinical Findings
Antigens (Ag) are produced from pathogens (bacteria, viruses, fungi, parasites)
circulate in plasma, lymph ... Ag-presenting cells ... storage sites (e.g. lymph ... nodes, spleen) ... pathophysiology #immunology
Signet ring cell histiocytes in lymph node sinuses! This can mimic metastatic adenocarcinoma. Histiocytes have ingested
Signet ring cell ... histiocytes in lymph ... node sinuses! ... #SignetRing #Cell ... #Histiocytes #LymphNode
X-Linked Agammaglobulinemia: Pathogenesis and clinical findings
The epidemiology of this disease is 1/340,000 births and roughly double
involved in B cell ... -> Impaired B cell ... adenoids, +/- lymph ... nodes • Increased ... pathophysiology #immunology
Neck Mass - Differential Diagnosis Algorithm
Congenital Neck Mass:
 • Thyroglossal Duct Cyst
 • Branchial Cleft Anomalies
Differential Diagnosis Algorithm ... : • Squamous Cell ... Spread to Cervical Lymph ... Nodes) • Melanoma ... Differential #Diagnosis #Algorithm
Here we see a CT-image.
The azygoesophageal recess is displaced by lymph nodes that compress the left
is displaced by lymph ... nodes that compress ... diagnosis of small cel ... a biopsy of a lymphnode
Here is a lymph node with florid follicular hyperplasia typical of HIV lymphadenitis (so-called "pattern A",
Here is a lymph ... node with florid ... Warthin-Finkeldey type giant cells ... Monocytoid B cells ... Pathology #Microscopy #LymphNode
Langerhans Cell Histiocytosis (LCH)

Granulomatous Lesions comprising langerin-positive histiocytes and an inflammatory infiltrate can arise in virtually
Langerhans Cell ... of Langerhans cells ... Lymphadenopathy: Swollen lymph ... nodes ... Birbeck granules (EM