Tariq Siddiqui ( Dcpartment of Medicine, Aga Khan University Hospital, Karachi. )
Ultrastructural features of the leucocytes in two patients suffering from the May-Hegglin anomaly were studied using electron microscopy. In both the cases, electron dense material parallel to the long axis of the inclusions were noted. Platelet ultrastructure was normal. A review of the literature indicates that the May-Hegglin anomaly is a heterogenous condition both ultrastructurally and clinically (JPMA 47:224, 1997).
The May-Hegglin anomaly is an autosonial dominant disorder. Morphologically. it is characterized by basophilic leucocyte inclusions, giant platelets and an associated thrombocytopcnia which is usually moderate in nature. Clinically the May-Hegglin anomaly is associated with a variable but often a mild bleeding disturbance1. Because the disorder is rare, it is easy to overlook the diagnosis. Nevertheless, even when the diagnosis is suspected the clinician must be careful to exclude other related but similar conditions which nevertheless are distinct from the May -Hegglin anomaly2. A useful investigation in this regard is to evaluate the ultrastructure of the leucocyte and the platelets by Electron microscopy. However, the information in this regard is quite limited in the literature to a few publications. This paper is a description of the ultrastructural features of the May- Hegglin anomaly in two cases seen at the University Hospital of Jacksonville in Florida USA. One of these cases has been the subject of a previous report3. It is hoped that this ultrastructural description will add to the literature on the subject.
Materials and Methods
Peripheral blood samples of the two patients who had the May- Hegglin anomaly diagnosed on light microscopy were prepared for ultrastructural observation. Preparation involved creating buffy coats which were fixed with Trumps fixative4. These were then post-fixed in 2% osmium tetroxide and embedded in a low epoxy embedding medium as reported by Spurr5. Semi-thin sections at 0.5 microns were cut for light microscopy and were stained with toluidine blue. Ultra-thin sections were cut on a Reichert Jung ultracut E microtome, collected on copper grids and stained with lead citrate and uranyl acetate. Finally, the sections were examined and photographed with a Zeiss 9 electron microscope.
The May-Hegglin anonmly belongs to a family of hereditaxy macrothmmbocytopenias6. This group consists of Fcchtners syndrome which has nephritis, congenital cataracts, deafness with the hematologic findings of macrothronthocytes and leucocyte inclusions7. The inclusion bodies consist of dispersed filaments, ribosomes and some segments of rough and smooth endoplasmic reticulum. The recently described Sebastian syndrome by Grienacher has all the hematologic hallmarks of Fechtners syndrome but none of the clinical findings e.g., nephritis and deafness8. There are only a few studies which have described the ultrastructural features of the May-Hegglin anomaly. By contrast many reports have stressed the clinical srctrum of this disease and its association with other entities9-11. In general, the reports have suggested that the platelets membrane in the May Hegglin anomaly is normal ultrastructurally12, but the leucocyte inclusions have distinctive characteristics. Jordan (1964)13 and Cawley (l971)14 were the first to describe the ultrastructuml features of the leucocyte inclusions. These, they described as parallel in 5-20 nm in diameter that ran length wise and had associated 15-20 mn granules. Certain other inclusions were also described in 1971 by Jenis15 which were structurally somewhat different from the descriptions of Jordan and Cawley. These latter inclusions were highly organized paraczystalline array and were surreunded by endoplasmic reticulum. It was felt that the latter changes were similar to single standard depolymerised ribonucleic acid and thus implied an origin fmm the rough endoplasmic reticulum. The ultrastructural features of the two current cases of this present report resemble to some degree, the features described by Hamilton et al16. In their cases, a parallel bar arrangement of the leucocyte inclusions were the main features along witha slightly skewed arrangement. By contrast, inourcases the bars were pcrpendicularto the long axis of the inclusions. Recently, a report has described a case of the May-Hegglin anomaly where the inclusions had a haphazard dot like arrangement but nota spindle like appearance17. It is now generally agreed that the leucocyte inclusions in the May- Hegglin anomaly represent ribonucleic acid. The platelets in the May-Hegglin anomaly has generally been reported to have a normal ultrastructure. It appears then that the May-Hegglin Anomaly is more heterogenous than previously believed. This diversity appears to be a feature of both its ultrastructure and a number of recently described clinical feature9-11.
I would like to thank Mt Salirn Abdul Sultan Kerai and Mr. Sulaiman S. Gilani for the preparation of this article.
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