—  SPECIALTY CONFERENCE HANDOUT  —

Gastrointestinal Pathology
Thursday, March 11, 2004 - 7:30 p.m.
Ballroom A




Moderator:

MARY P. BRONNER
Cleveland Clinic Foundation
Cleveland, OH



Clinical histories are printed below.
Click on the case numbers for text and references of each case.
Click on each slide thumbnail image for an enlarged view

Case 1

submitted by:
LAURA W. LAMPS
University of Arkansas for Medical Sciences
Little Rock, AR

Clinical Summary:

A 35-year-old female presented to surgery clinic following two episodes of severe upper gastrointestinal bleeding. She denied significant weight loss, nausea, vomiting, or epigastric pain. Past medical history was significant for previous cholecystectomy, tonsillectomy, appendectomy, and two unremarkable pregnancies. Initial laboratory evaluation revealed mild anemia but no other abnormalities. Endoscopy was performed, and a 4 cm mass was found in the gastric cardia; biopsy revealed poorly differentiated carcinoma. The patient was scheduled for gastrectomy. On the day before surgery, a routine pre-operative pregnancy test was positive. Subsequent serum ß-HCG testing was obtained, yielding a ß-HCG level of 3,473 mIu/ml, consistent with a 4-week gestation. The patient denied pregnancy, as she was compliant on her oral contraceptive pills and had no physical signs of pregnancy. In addition, transvaginal pelvic ultrasound showed no intra-uterine gestation, nor evidence of ectopic pregnancy or adnexal masses. Serial ß-HCG measurements over the next week did not change significantly. The patient ultimately underwent surgery and an H&E section of the subtotal gastrectomy specimen is submitted for review.



Case 1 - Figure 1 - Low power view of the gastric mass shows a highly vascular, necrotic, hemorrhagic tumor

Case 1 - Figure 2 - Clusters of large tumor cells are seen within a background of dilated vessels and fibrinous debris.

Case 1 - Figure 3 - The majority of the tumor cells had bubbly purple cytoplasm with giant, bizarre nuclei.


Case 1 - Figure 4 - Small foci showed typical glandular differentiation.

Case 1 - Figure 5 - A large regional lymph node contained metastatic choriocarcinoma.

Case 1 - Figure 6 - ß-HCG immunostaining is strongly positive within trophoblastic tumor cells.




Case 2

submitted by:
JOEL K. GREENSON
University of Michigan Medical School
Ann Arbor, MI

Clinical Summary:

The patient is a 38-year-old female who underwent a partial mastectomy for invasive ductal carcinoma with 1 of 4 lymph nodes positive for metastatic disease. A CT scan of the chest showed esophageal thickening suggestive of a mass. Upper endoscopy revealed a submucosal mass in the lower esophagus from 33 to 37 cm. There was a central ulcer with umbilication. Multiple biopsies were obtained and the patient ultimately underwent a transhiatal esophagectomy. The slides and photomicrographs are from the resection specimen.



Case 2 - Figure 1 - Low-power scan of the lesion showing a well-circumscribed nodule in the submucosa.

Case 2 - Figure 2 - Medium-power view showing nests of eosinophilic spindle cells with an organoid pattern.


Case 2 - Figure 3 - High-power view showing relationship of the tumor to the overlying squamous mucosa with pseudoepitheliomatous hyperplasia.

Case 2 - Figure 4 - High-power view of tumor cells showing granular cytoplasm and single atypical nucleus.




Case 3

submitted by:
CHRISTINE M. HOBBS
Armed Forces Institute of Pathology
Washington, DC

Clinical Summary:

A 28-year-old female presented with occasional streaks of bright red blood in her stools. On further questioning the patient gave the history of frequent episodes of constipation. Proctosigmoidoscopic examination revealed two shallow ulcers in a nodular area of the anterior wall of the rectum at 8 cm. This area was biopsied and interpreted as adenocarcinoma arising from a tubular adenoma. A resection was subsequently performed and representative sections of this lesion are submitted for your review.



Case 3 - Figure 1 - A low power view of eroded rectal mucosa with crypts entrapped in disorganized fibromuscular stroma.

Case 3 - Figure 2 - Rectal mucosa with crypts lined by regenerative epithelium. There is adjacent erosion and a fibrinopurulent cap. Displaced groups of hypermucinous crypts are present in the submucosa.


Case 3 - Figure 3 - Same features as in Slide 2 under higher power.

Case 3 - Figure 4 - Large mucin-filled submucosal cystic spaces partially lined by simple columnar to cuboidal epithelium (colitis cystica profunda).




Case 4

submitted by:
SHARI L. TAYLOR
GI Pathology Partners, PC
Memphis, TN

Clinical Summary:

A 72-year-old woman presented with nausea, vomiting, and a 25-lb weight loss over a several week period. On physical examination, there was mild epigastric tenderness to palpation. A CT scan of the abdomen revealed a large mass at the root of the mesentery. An exploratory laparotomy was performed and several mesenteric biopsies obtained.



Case 4 - Figure 1 - Low power view demonstrating bands of fibrosis dissecting lobules of fat.

Case 4 - Figure 2 - There is extensive fat necrosis with attendant dense sclerosis. Note that the fibrous areas are paucicellular.

Case 4 - Figure 3 - Foci of dystrophic calcification are observed in areas of fat necrosis.


Case 4 - Figure 4 - Clusters of foamy macrophages are scattered throughout the areas of fat necrosis.

Case 4 - Figure 5 - In some areas, a chronic inflammatory infiltrate is present, consisting primarily of lymphocytes and plasma cells, with occasional eosinophils.

Case 4 - Figure 6 - The chronic inflammatory infiltrate also includes several lymphoid aggregates.




Case 5

submitted by:
SUSAN C. ABRAHAM
Mayo Clinic
Rochester, MN

Clinical Summary:

A 68-year-old man was admitted to an outside hospital because of epigastric pain, melena, and hematemesis that required multiple transfusions. His past medical history was significant for cardiomyopathy that had required pacemaker insertion, and he was receiving aspirin and Coumadin at the time of his gastrointestinal bleed. Upper endoscopic examination during that admission revealed a large gastric ulcer located in the posterior aspect of the antrum. The patient was told that he was negative for H. pylori (although it is not clear from the medical record how that determination was made). He was started on Prevacid 30-mg b.i.d. Because of persistent mild epigastric pain as an outpatient, repeat upper endoscopy was performed 9 months later and showed a persistent posterior antral ulcer that measured 5 cm. He eventually underwent hemigastrectomy with vagotomy and a Billroth II gastroduodenal anastomosis. The slide shown includes both antral ulcer and adjoining viable antral mucosa and wall. The duodenum (to be shown later) had similar findings but lacked ulcers.



Case 5 - Figure 1 - Active chronic ulcer site in the antrum shows luminal fibrinoinflammatory exudate and underlying granulation tissue.

Case 5 - Figure 2 - Obliterative phlebitis is present in a submucosal vein beneath non-ulcerated gastric mucosa. The adjacent artery is normal.

Case 5 - Figure 3 - Phlebitis also involves vessels of the muscularis propria and subserosa, seen here in the duodenal wall.


Case 5 - Figure 4 - Prominent intra- and perivenular lymphoplasmacytic infiltrates.

Case 5 - Figure 5 - Granulomatous phlebitis.


Case 5 - Figure 6 - Lymphocytic gastritis in the non-ulcerated gastric antral mucosa.

Case 5 - Figure 7 - Mild lymphocytosis is also present in the duodenal epithelium, and there is associated villous blunting.