Paratesticular well-differentiated liposarcoma initially diagnosed as fibrous pseudotumour.

Paratesticular tumours are relatively rare and mostly of the mesenchymal origin. Due to its rarity, general surgical pathologists might have limited experience on the diagnostic entities and relevant differential diagnoses related to mesenchymal paratesticular tumours. This may likely cause diagnostic difficulties in a daily pathology practice. Paratesticular liposarcoma is a highly heterogeneous tumour and may be misdiagnosed as a benign fibromatous lesion. Herein we present a case of well-differentiated paratesticular liposarcoma of the sclerosing type initially diagnosed as a fibrous pseudotumour. Main differential diagnostic considerations are highlighted.

Sarcomatoid Squamous Cell Carcinoma of the Penis - a Report of Two Cases.

BACKGROUND: Sarcomatoid (spindle cell) squamous cell carcinoma is a rare, highgrade, aggressive tumor consisting of the squamous cell carcinoma admixed with the malignant spindle cell (sarcomatoid) elements. These tumors are relatively uncommon in the genitourinary system and particularly in the penis. MATERIALS AND METHODS: Two sarcomatoid squamous cell carcinomas of the penis were diagnosed in our hospital between 2012 and 2015. Clinical histories, pathology reports, hematoxylin and eosin-stained and immunohistochemical slides were reviewed. RESULTS: In both cases, the tumors presented as single, pedunculated, extensive masses with surface ulceration; histology study showed a mixture of high-grade squamous cell carcinoma component and spindle cell neoplastic component in different proportions. Immunohistochemical stains of CK AE1/AE3, p63 and CK903 showed positive immunoreactivity in both components in both cases. Vimentin was positive in spindle cell component and negative in squamous cell carcinoma areas. CONCLUSION: Sarcomatoid squamous cell carcinoma of the penis is an uncommon tumor of this site with aggressive behavior and bad prognosis which might be related to the delay in medical examination and diagnosis. A correct and thorough morphological study is of great importance for the staging of the disease, treatment and follow up of patients.

Diagnostic Value of ERG in Prostate Needle Biopsies Containing Minute Cancer Foci.

BACKGROUND: Prostate carcinoma (PC) is the second most diagnosed cancer in men population worldwide. The small amount of the tissue in prostate needle biopsy is often sufficient for the correct interpretation. Novel antibodies, as ERG, could add to the diagnostic value of IHC study in analysing difficult core biopsies. AIM: The aim of the present study was to establish a diagnostic use of ERG in a work-up of prostate needle biopsies containing minute PC, individually and in combination with AMACR/34ßE12. MATERIALS AND METHODS: From total number of 1710 consecutive prostate needle biopsies based on HE stain 114 biopsies containing minute PC. Selected biopsies were incubated with anti-ERG, AMACR and 34ßE12 antibodies using immunohistochemical technique. RESULTS: Among 98 selected biopsies, 57 showed positive and 41 negative ERG staining. AMACR staining was positively expressed in 86 of the cases and completely absent in remaining 12. In 9 of the AMACR-negative cases the final diagnosis was establish by manifestation of ERG expression in the tumour foci. 95 of the biopsies demonstrated lack of 34ßE12 expression and only 3 cases showed weak patchy staining. Among these cases 2 were ERG-positive. CONCLUSION: ERG antibody could be especially helpful in the cases with controversial expression of AMACR and 34ßE12.