Haemoglobin spherulosis: Fine needle aspiration biopsy of an unusual ocular lesion.

Objective: Haemoglobin spherulosis (HS) is a rare lesion occurring post‐vitreous haemorrhage that is absent from the cytopathology literature. Methods: We present the fine needle aspiration (FNA) biopsy cytological features of a case of HS occurring in a 73‐year‐old woman. Results: FNA smears of hemorrhagic vitreous fluid showed numerous variably sized smooth glassy spherules ranging from 3‐20 μm. Occasional red cells and a rare lymphocyte were observed, but other cell types were absent. Immunohistochemical staining of a cell block showed diffuse positive staining of spherules with haemoglobin A. Conclusions: HS is a rare lesion that occurs post‐subretinal haemorrhage and may be encountered by pathologists examining ocular cytological specimens. [ABSTRACT FROM AUTHOR]