Pancreatic polypeptide cell hyperplasia of the pancreas.

A case of pancreatic polypeptide cell hyperplasia in a 76-year-old man who presented with subacute bowel pseudo-obstruction is reported. A computed tomography scan incidentally showed a pancreatic head lesion that was resected by pancreaticoduodenectomy. Histological examination showed expansion of the endocrine pancreas with increased numbers of pancreatic polypeptide cells in irregularly enlarged islets, ragged endocrine cell clusters, ductulo-insular complexes and microadenomas. The clinicopathological features of this rare and poorly understood condition are discussed.

Pancreatic carcinoma: report of two cases presenting with unusual metastases.

We report two patients with adenocarcinoma of the body and tail of the pancreas who presented with features localized to the metastatic sites. A 67-year-old gentleman presented with right groin mass due to spermatic cord metastasis and later developed duodenal obstruction; the other gentleman was 69 years old and presented with change of bowel habit as a result of pelvic/pararectal metastasis.

Recurrence of rectal carcinoma in the mediastinum.

Mediastinal metastases arising from a primary gastrointestinal neoplasm usually follow extensive subdiaphragmatic spread. However, we have reported the rare recurrence of rectal carcinoma in the mediastinum. In addition to emphasizing the systemic metastatic spread of rectal carcinoma, this case demonstrates the need to consider metastases arising from abdominal tumors as a cause of mediastinal masses.

Multiple pulmonary microemboli complicating pneumonectomy.

Pulmonary embolism is widely recognized to complicate abdominal and lower limb orthopedic surgical procedures, but in comparison, it is seldom recognized to hamper the postoperative progress of patients after thoracic operations. We present 4 patients in whom multiple pulmonary emboli developed after pneumonectomy, 2 of whom were treated successfully. We discuss the mostly atypical presentation and the physiological and clinical consequences, and also suggest a mode of management.

Biochemical evidence for an increased and progressive deposition of collagen in lungs of patients with pulmonary fibrosis.

To assess the role of changes in lung collagen in pulmonary fibrosis, the content of this protein was measured in biopsy and autopsy lung from patients with cryptogenic fibrosing alveolitis (CFA), a fibrotic lung disorder of unknown cause. The collagen concentration was measured in lung samples from 21 patients with CFA (14 autopsy and seven open-lung biopsy) and 17 normal subjects; total lung collagen was determined in the right lung of 10 patients who died from CFA and the results were compared with those from 10 normal lungs. There was a wide variation in the collagen concentrations but the mean value (+/- SEM) for patients with CFA (217 +/- 13 mg/g dry weight) was significantly higher (P less than 0.02) than that of the controls (155 +/- 15 mg/g dry weight). The mean collagen concentration of the autopsy samples (243 +/- 20 mg/g dry weight) was significantly higher (P less than 0.05) than that of the biopsy samples (165 +/- 24 mg/g dry weight). The mean total collagen was markedly raised (P less than 0.001) in right lungs of patients with CFA (32.5 +/- 4.3 g) compared with normal lungs (14.0 +/- 1.1 g). When corrected for the predicted lung volume this difference in total lung collagen remained statistically significant (P less than 0.01, mean for patients 4.7 +/- 0.7 mg/ml, controls 2.3 +/- 0.2 mg/ml). These results demonstrate an increased deposition of lung collagen in this form of pulmonary fibrosis. They also suggest that there is a greater collagen concentration in lungs of patients with later disease, indicating a progressive deposition of collagen during the course of the disease.