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Odontogenic keratocyst is an aggressive cystic lesion and a common type of tooth derived cyst due to presence of odontogenic epithelial remnants in different regions of jaw. In majority of cases, it is located in mandibular posterior region. But it can also be found in the maxilla especially in the canine region. We present a rare case of OKC in maxillary sinus which associated with ectopic third molar. Also, it can be easily confused with other lesions of maxillary sinus like sinusitis or antral polyps, which usually resemble symptomatically. There can be malignant transformation of this benign condition towards squamous cell carcinoma or ameloblastoma. So an early and accurate diagnosis of odontogenic keratocyst is a challenge for pathologists.

This study revealed maximum mucocutaneous lesions in the CD4 count range of 200-500. Nail changes accounted for the most common cutaneous manifestation with 53%, and pigmentation accounted for the most common oral manifestation with 39%. Mucocutaneous manifestations can arouse one to suspect the diagnosis of HIV infection in an otherwise healthy unwary patient. They can serve as a dependable marker of HIV disease.

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Benign fibrous histiocytoma (BFH) is a benign fibrohistiocytic neoplasm. It is documented to occur in all anatomic sites with a strong predilection for sun exposed skin surfaces. Intra oral occurrence of BFH comprises a lesser percentage of cases with tongue being the least reported site. We report a case of BFH of the tongue with an emphasis on its histogenesis and a review of the literature.