Gastrointestinal stromal tumor (GIST) are the most common non epithelial tumor of the gastrointestinal (GI) tract. They arise from interstitial cells of Cajal present in the myenteric plexus. They can also arise outside the GI tract from mesentery, retro peritoneum and omentum. With the advent of new targeted molecular therapy c- tyrosine kinase inhibitor (Imatinib), it has become important to differentiate between response and pseudo-progression of the disease as response evaluation criteria for GIST are different from Response Evaluation Criteria in Solid Tumors (RECIST). Purpose of this pictorial essay is to enumerate the characteristic CT features of GIST, and discuss atypical features and response evaluation criteria.

Endometriosis is the presence of normal endometrial glands and stroma outside the endometrium, seen in women in the reproductive age group. Endometriosis is common in the pelvis in the pouch of Douglas, rectum, urinary bladder, and uterosacral ligaments. Although extrapelvic endometriosis is uncommon, endometriosis at extrapelvic sites such as the gastrointestinal tract, urinary tract, lung, skin, brain, and scar site has been reported and can mimic other benign and malignant lesions. It is a difficult diagnosis when patients have a preexisting neoplasm as metastasis can be a differential. The clinical history, imaging features, and a strong suspicion of this entity in the reproductive age group help accurate diagnosis of this entity. We present a rare case of deep pelvic (periureteral) endometriosis in a 41-year-old woman with history of papillary carcinoma of the thyroid gland causing diagnostic dilemma on imaging and histopathology and also discuss briefly the imaging findings of endometriosis.

<p class="abstract"><span lang="MT">Cavernous hemangioma of the nasal cavity is extremely rare with only case reports in the literature highlighting the imaging findings on CT and MRI. Haemangioma are benign vascular tumours, which originate in the skin, mucosa and deep structures such as bones, muscles and glands. Exact etiopathogenesis of the haemangioma is not known, although they are divided into two types depending on the dominant vessel size at microscopy, capillary and cavernous. When these neoplasms arise in the nasal cavity, they are predominantly capillary and are found to arise from the nasal septum and are more common in the children. On the other hand, Cavernous haemangiomas are more likely to be found on the lateral wall of the nasal cavity and are more commonly seen in elderly. Also, inverted pappiloma also more commonly arise from the lateral wall of the nasal cavity, from the middle turbinate and also has the same demographics as the cavernous hemangioma. So, the distinction between the two should be carefully made based on the imaging findings so as to give the appropriate treatment to the patient. We have presented a rare case cavernous haemangioma arising from the mucosa of the middle nasal meatus, in a 37-year-old male which is mimicking as an inverted pappiloma based on the imaging features; however on histopathology proved to be cavernous hemangioma and also on the multimodal imaging that helps in early diagnosis and advocating appropriate and timely treatment</span><span lang="EN-IN">.</span></p>

Otitis media (OM) is a common problem involving children. In the majority, the cause is related to dysfunction of the Eustachian tube due to bacterial or viral rhinitis and less commonly due to nasopharyngeal tumors. We present a case of recurrent OM which was evaluated and incidentally found a nasal foreign body for which the patient was asymptomatic. This nasal body was the cause of recurrent OM which is very unusual.