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19 May 2010 - Case of the Week #179

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Thanks to Heide Facklam, University of Bern, Switzerland, for contributing this case.




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Case of the Week #179

Clinical history:
A 62 year old woman presented with sudden epigastric pain. Her medical history included hypertension, nicotine abuse, pneumonia one year prior to admission and Psoriasis vulgaris treated with methotrexate until 2006. She had no history of recent trauma.

Physical examination revealed a tense abdomen, diffuse abdominal pain and a blood pressure of 91/63. Laboratory tests showed decreased hemoglobin of 88 g/L but her white blood cell and platelet counts were within normal limits.

Ultrasound and CT scan (below) revealed rupture of a normally sized spleen. CT scan demonstrated perisplenic hematoma and blood in the abdominal cavity. At open splenectomy, approximately 3 liters of hematoma was removed.

The resected spleen was normal weight and size (80 grams, 8x7x1.5 cm). The cut surface had multiple circumscribed, cystic, spongy, blood filled nodules ranging from 0.2 to 1.3 cm. Several foci were close or adjacent to the organ capsule.

Radiology images:

CT scan



Gross images:


Microscopic images:

3.5x

40x



Immunohistochemistry images:

CD34

CD68

CD21

CD8



What is your diagnosis?

Click here for diagnosis and discussion:



Diagnosis: Littoral cell angioma of the spleen

Discussion:
Microscopy showed tall lining cells with vesicular nuclei and small nucleoli, in addition to several exfoliated cells in the vascular spaces and hemophagocytosis. The cystic lesions correspond to a network of anastomosing, complex vascular spaces of varying diameter. Papillary projections and cyst-like spaces were also demonstrated. No atypia was present. Immunohistochemical analysis showed positive staining of the lining cells with CD21, CD68 and CD31 (not shown) but negative staining for CD34 and CD8.

Littoral cell angioma is a rare tumor of the spleen, first described in 1991 (AJSP 1991;15:1023). The tumor cells appear to derive from littoral cells, the specialized endothelial cells that line the splenic sinuses. The littoral cells lie on a fenestrated basement membrane and are separated by tight junctional complexes. They have an endothelial and histiocytic immunophenotype, and are negative for CD34, in contrast to conventional endothelial cells (Arch Pathol Lab Med 2004;128:1183).

The differential diagnosis of splenic vascular lesions includes:
Splenectomy is usually curative. Littoral cell angioma typically has a benign clinical course, although exceptional cases with malignant behavior have been reported (Am J Surg Pathol 2006;30:1036). In this case, the patient has remained well at 10 months of follow up.

Additional references: Am J Surg Pathol 1997;21:827


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