Guideline for Evaluation of Oral Ulcers Associated with Cytopenias and Multi‑Organ Dysfunction

Acute Leukemia and Other Hematologic Malignancies

• Acute leukemia, particularly acute myeloid leukemia, should be considered the most urgent diagnosis when oral ulcers coexist with neutropenia, elevated transaminases, and acute kidney injury; immediate bone‑marrow biopsy and hematology consultation are required to reduce mortality. 1
• In young adults, neutrophil percentages below 2 % together with oral ulceration have been linked to acute monocytic leukemia (M5 subtype). 2
• When a complete blood count reveals marked neutropenia with oral ulceration, an immediate bone‑marrow biopsy with immunophenotyping is mandatory. 3
• Definitive diagnosis of hematopoietic and lymphoid neoplasms requires immunohistochemical assays and T‑cell receptor immunophenotyping. 2
• Extranodal NK/T‑cell lymphoma (nasal‑type) can present with severe oral erosion/necrosis; diagnosis is confirmed by hematoxylin‑eosin staining and immunohistochemistry. 4
• NK/T‑cell lymphoma may also cause hepatic and renal dysfunction as part of multi‑organ involvement. 4

Infectious Etiologies

• HIV antibody testing is a mandatory component of the initial work‑up for patients with oral ulcers and neutropenia. 3
• Tuberculosis can manifest as stellate oral ulcers with undermined edges, accompanied by systemic signs and abnormal liver function. 5
• Invasive fungal infections should be suspected in neutropenic patients who have elevated transaminases, indicating possible hepatic involvement. 6

Immediate Laboratory Evaluation (Within Hours)

• Perform a full blood count with differential to quantify neutropenia and screen for leukemic blasts. 3
• Obtain a peripheral blood smear to identify blast cells or other abnormal morphologies. 1
• Conduct coagulation studies before any invasive oral procedure to prevent bleeding complications. 3
• Order a comprehensive metabolic panel to assess the severity of hepatic and renal dysfunction. 2

Urgent Specialized Testing (Within 24–48 h)

• Bone‑marrow biopsy with immunotyping is indicated when leukemia is suspected based on hematologic results. 1
• Serum 1,3‑β‑D‑glucan and galactomannan assays should be performed to detect invasive fungal infection in neutropenic patients. 5
• Autoimmune serologies are recommended if a systemic autoimmune disease is part of the differential diagnosis. 2

Oral and Tissue Biopsy Considerations

• Biopsy is required for oral ulcers persisting longer than two weeks, but must be delayed until coagulation parameters are normal and platelet counts are adequate. 3
• Multiple biopsies may be necessary when ulcers display differing morphological features. 1
• For suspected lymphoma, hematoxylin‑eosin staining combined with immunohistochemical studies is essential. 4
• Ziehl‑Neelsen staining should be employed when tuberculosis is a diagnostic consideration. 5

Imaging

• Chest radiography is useful to evaluate pulmonary involvement of tuberculosis or lymphoma. 5
• Computed tomography is indicated when bone involvement or deep‑tissue extension is suspected. 4

Critical Clinical Pitfalls

• Do not postpone hematology consultation when neutropenia accompanies oral ulcers; prompt evaluation for acute leukemia is life‑saving. 1
• Avoid performing oral biopsies before confirming normal coagulation status and sufficient platelet count to prevent severe bleeding. 3
• A thorough medication history is essential because drug‑induced agranulocytosis is reversible once the offending agent is identified and discontinued. 4
• In any neutropenic patient with elevated liver enzymes, consider invasive fungal infection and initiate appropriate antifungal therapy without delay. 6

Diagnostic Approach to Multiple Mouth Ulcers

Introduction to Diagnostic Criteria

• The International journal of oral science recommends that erosive lichen planus, pemphigoid, and pemphigus be diagnosed using immunofluorescence 7

Diagnostic Algorithm

• The American Academy of Oral Medicine suggests documenting the location of mouth ulcers precisely, assessing for vesicles or bullae, checking for extraoral manifestations, and obtaining a detailed history to guide diagnosis 8

Laboratory Testing and Biopsy

• The International journal of oral science and the American Dental Association recommend first-line laboratory testing, including full blood count, fasting blood glucose, and HIV antibody and syphilis serology, to exclude underlying conditions such as leukemia, anemia, neutropenia, and diabetes 7, 8
• The American Academy of Oral Medicine suggests that biopsy is mandatory if ulcers persist beyond 2 weeks without clear diagnosis, and multiple biopsies are needed when ulcers have different morphological characteristics 7, 8

Critical Considerations

• The International journal of oral science and the American Dental Association advise against delaying biopsy beyond 2 weeks for persistent ulcers, as malignancy and serious systemic diseases must be excluded, and against overlooking systemic associations, as multiple oral ulcers may indicate Crohn's disease, blood disorders, or autoimmune conditions 7, 9