Inflammatory pseudotumour arising from periampullary carcinoid: a "cancer-like" tumour in a "fake" tumour.

Carcinoid tumours of the gastrointestinal tract are uncommon, generally slow-growing and associated with a good prognosis. We present a 52-year-old Chinese woman with a carcinoid at the ampulla of Vater, a site far less common than other areas of the gastrointestinal tract. Preoperative imaging showed a pancreatic mass with displacement and possible invasion of the portal vein associated with peripancreatic nodal enlargement. A radical pancreaticoduodenectomy with portal vein wedge excision was performed. An intraoperative biopsy of the enlarged nodes was negative for malignancy and postoperative histology of the large pancreatic mass yielded a surprising finding of a carcinoid tumour at the ampulla of Vater with a large inflammatory pancreatic mass adherent to the portal vein. This is an uncommon case associated with "pseudotumour pancreatitis", causing biliary and pancreatic duct obstruction mimicking a large tumour in the head of the pancreas.

Desmoid tumour following a distal radius fracture--a complication or a coincidence?

We describe a case of a desmoid tumour occurring 15 months following an uncomplicated fracture of the left distal radius. The occurrence of a desmoid tumour after fracture is extremely rare and a Medline search revealed only two previous reports. The correlation between the site of trauma and the tumour and the time interval between trauma and presentation strongly supports a causal role of the fracture in the occurrence of this tumour.

Primary retroperitoneal mucinous cystadenocarcinoma in a male patient.

Primary retroperitoneal mucinous cystadenocarcinomas (PRMCs) are rare. This is the first reported case in the literature in English of PRMC in a man. The 64-year-old man presented with a large retroperitoneal cystic tumour measuring 24 x 20 x 16 cm3, which was removed intact. Areas ranging from a benign mucinous cyst to borderline mucinous tumour to mucinous cystadenocarcinoma were observed on microscopy. Strong patchy staining for cytokeratins 7 and 20 and strong diffuse staining for MUC2 and MUC5AC core peptides, similar to staining patterns in ovarian mucinous tumours, were shown in the benign and atypical epithelium. Staining for CA19.9 and carcinoembryonic antigen was also shown by both components. The theory of its origin from the mucinous metaplasia of peritoneal (mesothelial) inclusion cysts, rather than from ectopic ovarian tissue or ovarian teratomas, is supported by the occurrence of such a tumour in a male patient.

Diabetic muscle infarction of the peroneus brevis: a case report.

Diabetic muscle infarction of the peroneus brevis is a rare complication of diabetes mellitus. It often presents with an acute leg pain without any obvious signs. Due to poor awareness of this condition, it is often misdiagnosed and results in anxiety of the patient and unnecessary investigations. It is ominous as it usually indicates vascular disease of the end organs. We report a case where the patient presented to several physicians for leg pain without any other clinical signs. The diagnosis was suspected on ultrasound and confirmed with biopsy. The symptoms improved dramatically after excision. Although most literature suggests conservative treatment by non-weight bearing and analgesia, the recovery period can last for more than 6 weeks, with a recurrence rate of 50%. We feel that there is a role for excision biopsy of the lesion for both diagnosis and treatment. In this case, symptoms improved remarkably and the patient was able to ambulate without pain 2 days after the operation without needing any analgesia.

Hep Par 1 expression in carcinoma of the cervix: implications for diagnosis and prognosis.

AIMS: To determine the frequency and pattern of Hep Par 1 expression in cervical carcinomas of various histological types and to correlate expression with prognostic parameters. METHODS: Twenty nine cervical carcinomas were analysed for tumour type, hepatoid and neuroendocrine differentiation, and vascular invasion. A semiquantitative analysis was performed for Hep Par 1, alpha fetoprotein, chromogranin, and synaptophysin immunoreactivity. RESULTS: Hep Par 1 expression was seen in seven of the 29 cervical carcinomas (three of seven adenocarcinomas, one of 17 squamous cell carcinomas, one of two adenocarcinomas with adenocarcinoma in situ, one of two adenocarcinomas in situ, and one of one large cell neuroendocrine carcinoma with adenocarcinoma in situ). Normal looking endocervical epithelium was also positive in one case. Cases expressing Hep Par 1, with or without neuroendocrine coexpression, were associated with a higher rate of vascular invasion and a worse prognosis. Three of the five cases expressing neuroendocrine markers also coexpressed Hep Par 1. CONCLUSIONS: Hep Par 1 expression in carcinoma of the cervix is not uncommon and is present in a variety of histological types. Expression of this marker appears to be associated with more aggressive biological behaviour and a worse prognosis. The uterine cervix is another site that may express Hep Par 1 and hence the use of this antibody in situations of diagnostic difficulty, especially involving lesions within the liver, have to be coupled with the knowledge of the range of tissues it may stain.

Cervical cytology: an audit in a Singapore teaching hospital.

OBJECTIVES: To describe the cervical cytology diagnoses and cyto-histological correlation in the Department of Pathology, National University of Singapore in 1997 and to compare the data with international figures. METHODS: A database search of all cervical cytology cases diagnosed in the department in 1997 as well as follow-up biopsies was carried out. The data was then critically analysed. RESULTS: 10,207 cases were reviewed. 96% of the cases had a diagnosis of "negative". Under 1% of cases were labelled as "inadequate". "Atypia" was diagnosed in 1% and dysplasia and/or malignancy was diagnosed in 1%. These figures correlate well with international data. Of the dysplasia cases, 78% were followed by biopsy. Of the high-grade dysplasia cases that were biopsied, 97% of the biopsy diagnoses were within the acceptable concordance range with the cytology diagnoses and in only 3% was there a significant discrepancy. Of the cases diagnosed as atypia, 39% were subsequently biopsied at the same institution as the next procedure and only one showed high grade dysplasia. A total of six cases showed a significant discrepancy between the cervical cytology result and the subsequent biopsy diagnosis and these were reviewed to elucidate the reasons for the discrepancies. CONCLUSION: The cervical cytology service is of a high diagnostic standard. A subset of patients is probably being prematurely biopsied and may benefit from having a repeat smear instead. Specific clinical protocols regarding subsequent therapy following cytology results and closer cyto-histological correlation are two main areas where the cytology service can be improved.

Audit of transthoracic fine needle aspiration of the lung: cytological subclassification of bronchogenic carcinomas and diagnosis of tuberculosis.

INTRODUCTION: Transthoracic fine-needle aspiration cytology (FNAC) is a useful tool for evaluating neoplastic and inflammatory lung nodules. In view of the relative paucity of published audit studies regionally, such a study was undertaken to assess the use of the technique in our centre. METHODS: One hundred and fourteen FNACs were performed during 1997-1999. Immediate assessment for specimen adequacy was done. Diagnoses were correlated with clinical-pathological information and selective blind review performed. RESULTS: Cytologically, 65.8% of cases were malignant, 1.8% were atypical, 25.4% were inflammatory/non-malignant and 7% were inadequate. Cytological-histological tumour diagnostic concordance was 94.4%. Diagnostic sensitivity for malignancy: 93.4%, specificity: 95.8%, accuracy: 94%. Eight inadequate/ benign cases (7%) proved to be malignant with clinical-pathological follow-up. Tuberculosis was confirmed (acid-fast bacilli detected) in six cases (5.3%) and suggested in a further 10 cases (8.8%). The cytological review showed 96% concordance with the original benign/malignant diagnoses. Pneumothorax rate was 18%. CONCLUSION: FNAC is an accurate and safe method for the evaluation of lung nodules and it enables subclassification of bronchogenic carcinomas in the vast majority of cases. It is also useful for the diagnosis of tuberculous pulmonary nodules. Immediate assessment optimises specimen adequacy; inadequate/non-malignant smears in particular, need clinical correlation, close follow-up and re-biopsy, if necessary.

A case of Mycobacterium scrofulaceum osteomyelitis of the right wrist.

INTRODUCTION: The objective of the case report is to highlight the possibility of osteomyelitis caused by atypical mycobacteria. Such an infection may simulate tuberculous bone infection and yet fail to respond to standard anti-tuberculous drug therapy. CLINICAL PICTURE: A 66-year-old man who suffered from diabetes mellitus presented with osteomyelitis of the right wrist, with extensive synovial swellings of the flexor tendon sheaths. The clinical features, radiological appearances and histology suggested a tuberculous infection, but subsequent culture grew an atypical mycobacterium, Mycobacterium scrofulaceum. TREATMENT AND OUTCOME: There was good clinical improvement and control of the infection with a regime of kanamycin, ethambutol and ethionamide to which the organism was sensitive. CONCLUSION: This case illustrates the need to be aware of the possibility of infection with atypical mycobacteria in cases of suspected tuberculosis of the skeletal system which fail to respond to standard treatment.