Aim: This study aimed to document the total number of osteosarcomas of bone diagnosed in a referral hospital differentiating from its close mimics with biologic behavior. Materials and Methods: This study analyzes the total cases diagnosed as osteosarcoma from 2014 to 2016 in the Department of Pathology, SCB Medical College, Cuttack, Odisha. Results: A total of 21 cases were diagnosed with osteosarcoma, the most common subtype being conventional osteosarcoma. This subtype constituted the majority (18 cases); the age range varied between 14 and 20 years. This article describes two rare histologic subtypes; small cell variant and giant cell-rich osteosarcoma, a rare bone involvement, like mandibular jaw bone, in an elderly female was also documented along with histologic features of each one. Conclusion: Three cases with unusual histologic subtypes and rare bone involvement, gnathic type, prompted us to report these cases.

Blast phase of chronic myelogenous leukemia (CML) presenting as extramedullary blast proliferation is seen in only 6%–10% of cases. A bilineal blast proliferation of myeloid and T-cell lymphoid lineage is even rarer. These cases usually have various additional cytogenetic clonal abnormalities along with the presence of Philadelphia chromosome (Ph chromosome) or BCR-ABL fusion gene. Considered to be an aggressive hematologic malignancy, it needs prompt initiation of chemotherapy along with Imatinib and stem cell transplant. We report here a case of bilineal extramedullary blast proliferation in a 33-year-old male presenting with an initial diagnosis of CML. Lymphoblastic lymphoma, de novo acute myeloid leukemia are considered as close differentials; absence of proper clinical findings, lack of other components of myeloid differentiation can be potential pitfalls in arriving at a correct diagnosis.

Intraosseous lipoma (IL) is a rare benign bone lesion, and it constitutes about 0.1% of all bone tumors. The majority of cases are located in the metaphyseal region of the long bones in the lower limbs. We report a rare case of lipoma of the ilium in a 12-year-old male child presenting with mass over the right gluteal region. Meticulous marginal dissection was done, and a pedunculated mass originating from the lower right sacroiliac region was excised in toto. The case was an atypical example of an IL with a large outgrowth involving sacroiliac region with inconclusive magnetic resonance imaging and needle biopsy findings.

Squamous cell carcinoma of the external auditory canal (EAC) is a rare and unusual entity with an incidence of 0.2% cases of all head and neck carcinomas has been reported in the literature, and even fewer describe bilateral tumors. Its clinical presentation is similar to chronic otitis media or otitis externa. Hence, the diagnosis often delayed. Early diagnosis is directly related to the prognosis of the patient. The surgical treatment is a challenging task for the experienced skull base surgeon. Here, we report a case of metachronous bilateral EAC carcinoma in a 33-year-old male. The gap between the development of left and right side carcinoma is 3 years.

Microcystic adnexal carcinoma (MAC) is an uncommon, locally aggressive, malignant cutaneous tumor having pilar and eccrine differentiation and most commonly occurs in the head and neck region but rare among skin cancer. It is characterized by slow, but locally aggressive growth pattern with infiltration into surrounding structures which is characterized by a combination of keratinous cysts in the upper dermis, islands, and strands of small basaloid, benign-appearing keratinocytes or squamous cells in the deeper dermis within a dense desmoplastic stroma, and areas of ductal differentiation. We report a case of MAC of right cheek in a 50-year-old male patient with diagnostic challenges. MAC may include in the differential diagnosis list of slowly growing tumors of the face.

Brenner tumors are the rare solid ovarian tumor, malignant variant being rarer. It commonly presents with vaginal bleeding, a palpable pelvic mass, and pelvic pain. Mostly, it is unilateral with local dissemination and spreading beyond the pelvis to distant organs is rare. It closely resembles transitional cell carcinoma of urinary bladder. Optimal surgery in advanced disease and surgical staging in the early stage is the corner stone of management. We report a case of malignant Brenner tumor of the ovary in 70-year-old female treated with staging laparotomy followed by adjuvant chemotherapy and having no evidence of disease after 2 years follow-up.