Endometriosis is defined as the presence of ectopic endometrial tissue outside the uterine cavity. It is a benign condition commonly observed in women of the reproductive age group. It can occur in both pelvic and extra-pelvic sites. Moreover, pelvic endometriosis is relatively common, as compared to extra-pelvic endometriosis. The most frequent site for pelvic endometriosis is ovary. It can also affect rectum, uterosacral ligaments, rectovaginal septum, urinary bladder. Extra-pelvic endometriosis is rare and when it occurs, does so more frequently in surgical scar sites, especially in caesarean section scar. Endometriosis in an episiotomy scar is extremely rare but can lead to significant morbidity in patients due to local infiltration. This condition can be diagnosed by the presence of the classical clinical triad of history of episiotomy, tender nodule at the scar site and cyclical pain. Magnetic resonance imaging (MRI) is a very useful imaging modality to diagnose and assess the deeper extension of the lesion. Herein, we report one such case of episiotomy scar endometriosis in the perineum.

Adnexal masses pose a diagnostic dilemma to the gynaecologist as well as radiologist because of their varied spectrum. The most important thing that needs to be determined is that whether the lesion is benign or malignant, so that the patient gets the appropriate treatment based on the pathology. Hence, the aim of the present study was to determine the accuracy of MRI in diagnosing benign and malignant adnexal lesions and its correlation with histopathological findings. Materials and Methods: The present study was a prospective cross-sectional study which was conducted in the Department of Imaging and interventional Radiology of Meenakshi Mission Hospital and Research Centre, Madurai. Patients presented with history and clinical symptoms of adnexal tumours and patients with ultrasonography (USG) detected indeterminate adnexal masses were included in the study. Results: In this study, the accuracy of MRI was about 93% in identifying the benign and malignant lesions. The cystic characterization of lesion was detected in majority of the subjects 60 (66.7%) with the help of MRI compared to USG, where only 30 (33.3%) of the subjects were identified. The solid lesions were also better identified with the help of MRI i.e. 19(21.1%) cases, compared to USG in which 13(14.4%) cases were only assessed. Conclusion: In the present study, MRI was found to be highly specific (95%) and accurate (93%) in diagnosis of benign and malignant lesions.

Dentate nucleus, the largest deep nucleus of the cerebellum, is affected by numerous conditions, including leukodystrophies, toxins, drugs, infections, and various metabolic and inflammatory conditions. This case report is a drug-induced cerebellitis, caused by isoniazid (INH), characterized in magnetic resonance imaging (MRI) as bilateral dentate nuclei hyperintensity. Isoniazid, an antituberculosis therapy (ATT) drug, is both neurotoxic and hepatotoxic but cerebellitis is a rare complication. INH-induced cerebellitis is characterized in MRI by bilateral and symmetrical T2/fluid-attenuated inversion recovery (FLAIR) hyperintensity in dentate nuclei. Though metronidazole is the most common drug associated with such MRI signal changes in the dentate nucleus, the uncommon association with INH has been described in literature especially in patients with renal function impairment. MRI findings together with clinical signs of cerebellar involvement, in a patient with abnormal renal function tests and in whom the ATT regimen was recently initiated, favors the diagnosis of INH toxicity. INH withdrawal and pyridoxine supplementation can reverse this condition.

Garré's sclerosing osteomyelitis is a form of chronic osteomyelitis that commonly affects children and young adults. Here, we report one such case of Garré's sclerosing osteomyelitis in a 20-year-old female who presented with facial asymmetry and inability to open mouth. On clinical examination, it was bony hard swelling with trismus. History of infected second molar tooth extraction was present. Computed tomography scan showed thickening and sclerosis of the ramus and condylar process of mandible, on right side, with proliferative periostitis. Magnetic resonance imaging showed soft tissue edema and inflammation, in the form of enlargement of right masseter and pterygoid muscles with intramuscular fluid collection. On the basis of history, clinical signs, and imaging features, diagnosis of Garré's osteomyelitis with fascial space infection was made. To our knowledge, very few cases of Garré's osteomyelitis present with superimposed fascial space infection, as it is otherwise a nonsuppurative condition. Fistula formation is a very rare incidence as it is seen in our case.

Piriformis syndrome is a rare cause of sciatica, which results in low backache due to sciatic nerve compression. This syndrome is associated with abnormalities in the piriformis muscle, which cause sciatic nerve entrapment, like anatomical variations, muscle hypertrophy, and inflammation. It can also result from the abnormal course of sciatic nerve itself through normal piriformis muscle. Piriformis syndrome due to pyomyositis of the piriformis muscle is extremely rare and only 23 cases are reported in literature. Herein, we report one such rare case of a patient, with pyomyositis of piriformis muscle, who presented with piriformis syndrome.