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Competing Interests: There are no conflicts of interest.

We describe a rare case of follicular dendritic cell tumour which had arisen over the background of hyaline vascular type of Castleman's disease at the mediastinal location. Constellation of histology and immunohistochemistry using CD21 antibody and non-reactivity to CD15, CD30, cytokeratin and epithelial membrane antigen helped us diagnose this case. The literature is reviewed, specially with reference to the genesis of follicular dendritic cell neoplasm at the backdrop of Castleman's disease and its clinical relevance.

Primary undifferentiated embryonal of the liver in children is a rare neoplasm with dismal prognosis. Surgery is the treatment of choice. Adjuvant chemotherapy may prove useful in improving the prognosis of these tumours. We report two cases of Primary undifferentiated embryonal sarcoma of the liver.

This paper describes a papillary adenocarcinoma solely confined to the seminal vesicle, in a 26 year old male. Imaging techniques and operative findings revealed an enlarged seminal vesicle, harboring a grossly papillary and friable tumor. Strict criteria for diagnosis have been applied, in this unusual case. The young age and unusual location of this papillary adenocarcinoma prompted us to report this case.

This report documents the occurrence of an extragonadal malignant teratoma on the sole of the foot, in a young male. The patient also developed a groin nodule showing the same histology. The testes, retroperitoneum and mediastinum, which are usual sites of germ cell tumours were all normal, and no other primary could be detected. A teratoma growing in the tip of an extremity is a unique occurrence, biologically difficult to explain, and, which to the best of our knowledge has never been reported in literature.

The various religious communities in India viz.Hindu, Muslim, Christian, Parsi have different breast cancer incidence rate. It is not known whether there might also exist differences in biological properties of breast cancer between these communities. To investigate this possibility we have studied the distribution of oestrogen receptor (ER) status and histological grade of tumour in these four communities. Significant differences were observed in the overall distribution of ER positivity and histological grade between the communities P less than for both parameters). Christians had the highest incidence of ER +ve (65.2%) and grade I + II tumours (16.0%), while Muslims had the lowest incidence of ER +ve (35.8%) and Grade I + II tumours (4.7%). In general, we found a significant positive relationship between ER status and age of the patient (p less than 0.0.1). The mean age of the christians was slightly but significantly higher than that of the Hindus and Muslim. The difference ER positivity between the communities might, therefore, be partly (but probably not wholly) explained by difference in age of the patients. However, the difference with respect to grade of tumour cannot be explained as a function of age since no significant association was found between grade of the tumour and age of the patient. Further investigation with respect to difference in the biology of the breast cancer between the communities are warranted.

Twenty-two histologically confirmed cases of Clear Cell Sarcomas (C.C.S.) seen over a sixteen year period, are retrospectively analysed from a clinico-pathological view-point. The tumours occurred in young adults, average 36 years. Males predominated, and the lower extremity particularly the thigh and foot were the most commonly involved. Grossly, a connection with aponeurosis and tendon sheath has not been recorded consistently. Microscopically the tumour was distinctive, with their short fascicles and nests of polygonal to fusiform cells. The "clear" cytoplasm stressed in it's very name was not the rule. Melanin was demonstrated in 7 of the 22 cases, i.e. 32%, and these patients did not behave any differently from those where pigment was not seen. Immunocytochemistry for S-100 protein was done in 14 cases and was positive in 13 cases. Follow-up information revealed that 11 patients were dead of advanced disease in an average period of 24 months. Two patients were alive with disease for an average period of 3 years 7 months. Only 4 patients had no evidence of disease for periods ranging from 6 months to 26 months. Metastasis to nodes was a very frequent event, but lung and bony metastasis has also been documented.