Osteolipoma is a very rare histologic variant of lipoma that exhibits bone formation. According to the tumor presentation, endosteal, parosteal, and soft tissue variants are reported. Osteolipoma is an extremely rare tumor. They have been found at various sites, with the highest frequency in head and neck regions. We report a case of parosteal osteolipoma in the left distal femur.

Detection of oral cancer is only depend on biopsy. We analyzed the usefulness of smear cytology in the detection of the squamous epithelial lesions of the oral cavity. The author collected a total of 54 cases of oral cytology and some corresponding biopsies from the patients who had a leukoplakia or ulceration of the oral mucosa over 12 months. Cytology slides were prepared using ThinPrep method and stained with Papanicolaou stain. The cytologic diagnoses were categorized based on The Bethesda System and the histologic diagnoses were classified as negative, oral intraepithelial neoplasia (OIN) I, OIN II, OIN III, or squamous cell carcinoma. Cytohistologic correlations were reviewed. Three cases of invasive squamous cell carcinoma, 5 cases of OIN III, and 46 cases of non-neoplastic benign lesions (including 7 cases of reactive atypia and 39 cases of within normal limit) were detected. Three cases of reactive atypia and 1 case of OIN III were confirmed as OIN I through follow-up biopsy. The cause of error was interpretation error in all cases. The concordance rate of oral cytology and biopsy was 92.6%. Oral cytology is a useful primary screen of OIN and oral cancer.

Calcifying fibrous tumor (CFT) is a rare benign soft tissue mass consisted of abundant densely hyalinized collagen with calcifications and patchy infiltration of lymphocytes and plasma cells. The etiology and pathogenesis of this entity are unknown. Recently we experienced a case of CFT of the peritoneum in 37-year-old man. Complete removal of this lesion was performed.

Macrofollicular variant of papillary thyroid carcinoma (MFV-PTC) is a rare variant of papillary carcinoma. The tumors are easily misdiagnosed as benign due to their macrofollicular structures with bland-looking cytologic findings. The author experienced a rare case of MFV-PTC with pelvic bone metastasis 10 years after initial surgery. The patient was a 55-year-old female with a history of right thyroid lobectomy. The encapsulated nodule consisted of variable sized follicles with no nuclear atypia. The initial diagnosis was a nodular hyperplasia. She had recently suffered from pelvic discomfort due to metastasizing thyroid carcinoma. The thyroid was reevaluated and revised as MFV-PTC.