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An acephalic budding Cysticercus (= Racemose cysticercus) found at the abdominal wall of a man
Seung-Yull Cho,Baik Kee Cho and Won Young Choi
Department of Parasitology, College of Medicine, Chung-Ang University, Seoul 151, Korea.
Department of Dermatology, St. Mary's Hospital, Catholic Medical College, Seoul 100, Korea.
Department of Parasitology, Catholic Medical College, Seoul 135, Korea.
Abstract
An acephalic budding Cysticercus of 1.2 cm long was removed surgically at the abdominal wall of a Korean man. The worm revealed abnormal buds on the bladder wall and absence of suckers and hooklets in the scolex body. The buds were of two histologic types; branching bud covered with normal tegumentum and with subtegumental cells of normal density, and buds of proliferated subtegumental cells with lacunae formation. On the bases of the morphologic features, it was identified as a racemose cysticercus. This case confirms that its extracranial location is possible.
Figures
Figs. 1~4 Fig. 1. Acetocarmine stained total mount of the metacestode. "A" indicated the parenchymatous scolex body, which was placed at outside of bladder (see Fig. 2). "B" and "C" were abnormal buds which were enlarged in Figs. 3 and 4 respectively. Two arrows at lower right indicated the removed bladder wall for examination of normal histology (Fig. 5). ×9.
Fig. 2. Magnification of Fig. 1A. Suckers and hooklets were absent. Neck and spiral canal were simple. Vestibule was not evident. Acetocarmine stained, ×40.
Fig. 3. A cyst-like bud on the bladder wait (magnification of "B" in Fig. 1). Acetocarmine stained, ×40
Fig. 4. A parenchymatous buds on the bladder wall ("C" in Fig. 1). The mid-portion of the bud was darkly stained by acetocarmine. Random projections were present at outer surface. A cystic structure was seen within the bud. Acetocarmine stained, ×40.
Figs. 5~8 Fig. 5. A section of bladder wall where abnormal buds were not present (indicated by two arrows in Fig. 1), H&E, ×100.
Fig. 6. A section of mid-portion of the scolex body. Neck situated at the centre; spiral canal was poorly developed, simply encircled the neck; the linings of the spiral canal had few infoldings projected to the lumen of the canal. Vestibule was absent. H&E, ×25.
Fig. 7. A section of a branching bud, covered with tegumentum of normal thickness and had subtegumental cells of normal density. The neck of bud was short and narrow. A daughter bud (indicated by an arrow) arose the bud. H&E, ×250.
Fig. 8. A section of the second type bud. The arrow indicated the locus where subtegumental cells proliferated; covering tegumentum and inner connective tissue thickened. H&E, ×250.
Figs. 9~12 Fig. 9. A section of abnormal bud of the second type, showing the multifocal occurrence. H&E, ×250.
Fig. 10. Magnification of a part of Fig. 9. Increased number of subtegumental cells was recognized. Numerous cystic lacunae were present in the tegumentum or under a layer of subtegumental cells. H&E, ×250.
Fig. 11. A section of the second type bud. A large lacuna was formed between tegumentum and subtegumental tissue. Subtegumental cells proliferated and were intermixed with fibrous elements. H&E, ×250.
Fig. 12. Another section of bud of the second type. A lacuna was formed under tegumentum. Thickened tegumentum sloughed partly, and projections of tegumentum with fibrous tissue were seen. H&E, ×250.
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