Basaloid squamous carcinoma occurs most commonly in the upper aerodigestive tract. In the colon, the most common location is in the anal canal and is rarely reported proximal to the anal verge. Six cases are reported in the published literature, of which five are located distal to the splenic flexure. Outside the anal canal, it has been postulated that they arise from the basal cells, squamous ...

The basaloid carcinoma is a rare and distinct type of squamous carcinoma. Of all the squamous carcinomas, the basaloid tumor is noted for its high aggressivity and fast replication rate. It is usually discovered within the upper levels of the larynx (supraglottis), the tongue base or the piriform sinuses in male patients ranging from sixty to eighty years old. The aggressivity of the tumor also...

Malignant tumors of the ureter that display biphasic patterns are very rare; they include carcinosarcomas, sarcomatoid carcinomas and carcinomas with pseudosarcomatous stroma. Although the distinction between carcinosarcomas and sarcomatoid carcinomas has been extensively discussed in the past, the recent World Health Organization classification of urinary tract tumors (2004) does not distingui...