Sinusoidal hemangioma with secondary intravascular papillary endothelial hyperplasia.

In this case report, we present a case of a 47-year-old man with sinusoidal hemangioma with secondary intravascular papillary endothelial hyperplasia arising in the subcutaneous tissue. To the best of our knowledge, there are only two cases of sinusoidal hemangioma with secondary intravascular papillary endothelial hyperplasia reported till date, both of which were intramuscular hemangiomas. These are rare entities that also have overlapping histomorphological features with that of various other vascular tumors making histopathological diagnosis troublesome at times. Careful histopathological examination aided by immunohistochemical studies in difficult cases is essential to avoid these diagnostic pitfalls.

HPV related cloacogenic carcinoma of the anal canal with divergent histomorphology.

Cloacogenic carcinoma also known as basaloid squamous cell carcinoma is a rare anorectal tumor presenting with varied histomorphology. In this case report, we describe a case of 58-year-old man presenting with bleeding per rectum and pain. A polypoidal tumor was noted in anal canal which on microscopy was diagnosed to be cloacogenic carcinoma with transitional carcinoma-like, basaloid and mucinous patterns. An unusual finding in the present case was the presence of signet ring cells in the mucinous areas. A thorough knowledge of the wide histomorphological spectrum of the tumor and a limited IHC panel are crucial for the diagnosis. Here, we also present a review of literature and describe in detail the origin and histopathological features of the tumor.