Unexpected melanoma metastasis with E-cadherin expression in bone marrow

Area of Science:

• Hematopathology
• Oncology
• Immunohistochemistry

Background:

• Bone marrow biopsy (BMB) is crucial for diagnosing hematological disorders.
• Unexpected findings in BMB can lead to diagnostic challenges.
• E-cadherin expression is a common marker in hematopathology but can be expressed by other neoplasms.

Purpose of the Study:

• To report a case of melanoma metastasis mimicking hematological malignancy in BMB.
• To emphasize the diagnostic implications of E-cadherin expression in atypical cells found in BMB.
• To highlight the importance of considering melanoma in the differential diagnosis of E-cadherin-positive neoplasms.

Main Methods:

• Morphological evaluation of bone marrow biopsy.
• Immunohistochemical staining for E-cadherin and other markers.
• Review of patient history including suspected acute leukemia and myelofibrosis.

Main Results:

• Atypical cells with E-cadherin expression were identified in a BMB.
• These cells were diagnosed as melanoma metastasis, not acute leukemia.
• E-cadherin expression was confirmed in the metastatic melanoma cells.

Conclusions:

• E-cadherin expression in BMB is not exclusive to erythroid cells and can be seen in melanoma metastasis.
• Melanoma should be included in the differential diagnosis when E-cadherin-positive atypical cells are found in BMB.
• Careful morphological and immunohistochemical evaluation is essential for accurate diagnosis in challenging BMB cases.