Diverse Gatekeeper Role of a Hospital General Medicine Physician: A Case of a Pathologist with Recurrent Fever.

In Japan, general medicine (GM) has been recognized as a unique specialty addressing the needs of an aging society with complex comorbidities. GM physicians act as essential "gatekeepers," managing initial evaluations for diverse conditions and facilitating collaboration among various medical departments. This case study presents the critical nature of this role when clinical suspicion encounters diagnostic limitations. A young pathologist presented with recurrent fever. She expressed concern regarding possible occupational exposure during an autopsy and pathological specimen preparation performed months earlier on a deceased patient with an undetermined infection. Although the autopsy revealed widespread necrotizing granulomatous lesions associated with yeast-like fungi, the hospital's central laboratory was unable to identify the species. The GM physician used a professional network to consult an infectious disease specialist, who subsequently engaged a fungal expert. The pathogen was identified as Histoplasma capsulatum via PCR sequencing. However, the patient's subsequent test for histoplasma antibodies was negative, and a causal relationship between the recurrent fever and potential histoplasma exposure could not be established. Histoplasmosis is extremely rare in Japan and is typically associated with international travel. However, the deceased patient in this case had no recent history of overseas travel. Because laboratory assays for this high-risk fungus are not currently covered by the Japanese health insurance, such cases may remain undiagnosed. This report demonstrates that a general physician's ability to establish and coordinate specialist networks is crucial for resolving complex diagnostic challenges and ensuring the safety of healthcare workers.