In the leukemia case with atypical lymphocytes and a dry tap on marrow, which diagnosis is most likely?

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Multiple Choice

In the leukemia case with atypical lymphocytes and a dry tap on marrow, which diagnosis is most likely?

Dry marrow taps arise when the marrow becomes fibrotic, a feature classically seen in hairy cell leukemia. This disease involves mature B cells with hair-like cytoplasmic extensions, which infiltrate the marrow and cause fibrosis, leading to a dry tap. The combination of atypical lymphocytes with a dry marrow tap is thus most consistent with hairy cell leukemia. Other options don’t fit this marrow picture as well: one tends to have circulating lymphocytosis rather than a dry tap, another presents mainly with lymph node involvement, and the last shows myeloid blasts rather than lymphoid-appearing cells.

Dry marrow taps arise when the marrow becomes fibrotic, a feature classically seen in hairy cell leukemia. This disease involves mature B cells with hair-like cytoplasmic extensions, which infiltrate the marrow and cause fibrosis, leading to a dry tap. The combination of atypical lymphocytes with a dry marrow tap is thus most consistent with hairy cell leukemia. Other options don’t fit this marrow picture as well: one tends to have circulating lymphocytosis rather than a dry tap, another presents mainly with lymph node involvement, and the last shows myeloid blasts rather than lymphoid-appearing cells.

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