This video presents a histopathological case of Lobo mycosis (also known as lacaziosis or Jorge Lobo's disease), a rare fungal infection, particularly in the United States. The microscopic examination reveals characteristic uniform, perfectly circular organisms, distinct from Blastomyces by their tendency to form "string of pearls" or chain-like arrangements within granulomatous nodules. The speaker provides contextual information on its naming after Dr. Lobo and shares a curious fact about its occurrence in pink Amazon river dolphins. The typical clinical presentation involves keloidal nodules with associated dense fibrosis and scar tissue.
Summarizing a Case of Lobo Mycosis
0:00:05 Introduction to Lobo Mycosis: The video introduces a case of Lobo mycosis, a rare fungal infection (also known as lacaziosis or Jorge Lobo's disease), noting its infrequent observation in the United States.
0:00:10 Microscopic Examination: The sample shows muscle, fat, a thick epidermis, and a nodule containing histiocytes and foreign body giant cells.
0:00:20 Distinctive Organism Morphology: The fungal organisms appear as perfectly uniform, small white circles, similar in size to Blastomyces.
0:00:31 "String of Pearls" Arrangement: A key diagnostic feature is that these organisms often form chains or rows, metaphorically described as a "string of pearls" or "pop beads," which helps differentiate them from the more haphazard arrangement of Blastomyces.
0:01:12 Naming and Origin: The disease is named after Dr. Lobo, who discovered the fungus, and is also referred to as Lacaziosis.
0:01:34 Unique Host Fact: An interesting piece of trivia is that pink Amazon river dolphins can also contract Lobo mycosis.
0:01:55 Clinical Presentation: In addition to fungal organisms and granulomatous inflammation, the disease often presents clinically as keloidal nodules with significant dense fibrosis and scarring.
Key Takeaway: Lobo mycosis is a diagnostically distinct fungal infection, characterized by its "string of pearls" morphology and association with keloidal lesions, found predominantly in tropical regions and, uniquely, in Amazon river dolphins.