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A case of malacoplakia of the prostate in a 66-year old man is reported. This is the first time, that the diagnosis was established by needle biopsy. There are only eight previous reports of prostatic involvement. Three of these cases were initially misinterpreted as carcinoma. The present case is discussed in view of the pertinent clinical and pathological data in the literature.

We present the case of a sacrococcygeal chordoma which recurred 15 years after the radical removal as a soft tissue tumor in the gluteal musculature. This tumor consisted of two parts: a chordoma without symptoms of aggressive cellular proliferation and a malignant fibrous histiocytoma. During the following 4 years several local recurrences of the malignant fibrous histiocytoma occurred in the gluteal musculature. The patient finally died of lung metastases. No chordoma tumor tissue was found in the lungs, in the gluteal musculature or in the sacrococcygeal bone area. Histology including electron microscopy revealed no proof of a transition of chordoma into malignant fibrous histiocytoma. It must be assumed that the secondary soft tissue tumor originated from residual chordoma cells which were implanted during the operation of the primary tumor. It remains unclear whether the malignant fibrous histiocytoma arose from mesenchymal stromal cells within the chordoma or directly from primitive neuroectodermal chorda cells which possess the ability to differentiate into a variety of cell types including mesenchymal cells.

We report two new cases of rare idiopathic nodular calcinosis of the scrotum, which is characterized by intracutaneous chalky deposits restricted to the scrotum in otherwise healthy young men. Diagnosis has to be made histologically. Therapy consists of local excision.