7 November 2008 – Case of the Week #134
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We thank Dr. Angela Bohlke, Tulane University Hospital, New Orleans, Louisiana (USA) for contributing this case. To contribute a Case of the Week, email [email protected] with the clinical history, your diagnosis and diagnostic microscopic images in JPG, GIF or TIFF format (send as attachments, we will shrink if necessary). Please include any other images (gross, immunostains, etc.) that may be helpful or interesting. We will write the discussion (unless you want to), list you as the contributor, and send you $35 (US dollars) by check or PayPal for your time after we send out the case. Please only send cases with high quality images and a diagnosis that is somewhat unusual (or a case with unusual features).
Case of the Week #134
A 10 year old girl presented with abdominal pain and anorexia. CT scan showed a 15 cm heterogeneous liver mass. Following rupture of the mass into the peritoneum, she was taken urgently to the operating room exploration and ultimately resection.
Gross image: #1
What is your diagnosis?
Undifferentiated embryonal sarcoma
Undifferentiated embryonal sarcoma comprises 10% of pediatric tumors, and is the third most common pediatric hepatic tumor after hepatoblastoma and hepatocellular carcinoma. It commonly occurs at ages 6 to 10 years, and only rarely occurs in adults (Cancer 2008;112:2274). It typically presents with pain, fever, an abdominal mass and a normal serum AFP (J Pediatr Surg 2008;43:1912).
Grossly, the tumor is up to 30 cm, well demarcated and soft, with cystic, gelatinous, hemorrhagic or necrotic foci. Histologically, it has variable cellularity, and is composed of anaplastic and spindle cells with ill defined borders and prominent PAS+ diastase resistant hyaline globules. The nuclei have stippled chromatin and indistinct nucleoli. The stroma has numerous thin walled vessels, and may be myxoid. There is frequent mitotic activity. The tumor periphery may demonstrate trapped hepatocytes or bile duct structures. Tumor cells are immunoreactive for vimentin with a high Ki-67 index, and negative for myogenin and keratin (Appl Immunohistochem Mol Morphol 2006;14:193). The hyaline globules are negative for alpha fetoprotein.
The differential diagnosis includes mesenchymal hamartoma (usually < 1 year old, cystic tumor with bland tumor cells and no giant cells), embryonal rhabdomyosarcoma (usually 2-6 years old, myxoid mass extending into bile duct, rhabdomyoblastic differentiation with cytoplasmic cross striations, cambium layer present but no diffuse anaplasia or hyaline globules, myogenin+, myoD1+, Pediatr Dev Pathol 2007;10:89), sarcomatoid hepatocellular carcinoma and a mixed form of hepatoblastoma. Hydatid cyst is also a consideration in endemic areas (J Pediatr Surg 2008;43:E1).
Treatment is complete resection and chemotherapy (J Gastrointest Surg 2007;11:73), and the prognosis is now considered good (Cancer 2002;94:252). Large tumors may rupture and cause death (J Pediatr Hematol Oncol 2007;29:63).
Nat Pernick, M.D., President
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